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40180661 = 42195441
BaseRepresentation
bin1001100101000…
…1101110110101
32210121101111122
42121101232311
540241240121
63553113325
7665346533
oct231215665
983541448
1040180661
1120754364
1211558845
13842ab51
14549d153
1537da5ab
hex2651bb5

40180661 has 4 divisors (see below), whose sum is σ = 40276524. Its totient is φ = 40084800.

The previous prime is 40180643. The next prime is 40180663. The reversal of 40180661 is 16608104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14364100 + 25816561 = 3790^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 40180661 - 26 = 40180597 is a prime.

It is a super-2 number, since 2×401806612 = 3228971036793842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40180661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40180663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47300 + ... + 48141.

It is an arithmetic number, because the mean of its divisors is an integer number (10069131).

Almost surely, 240180661 is an apocalyptic number.

It is an amenable number.

40180661 is a deficient number, since it is larger than the sum of its proper divisors (95863).

40180661 is an equidigital number, since it uses as much as digits as its factorization.

40180661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95862.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40180661 is about 6338.8217359380. The cubic root of 40180661 is about 342.5092927310.

Adding to 40180661 its reverse (16608104), we get a palindrome (56788765).

The spelling of 40180661 in words is "forty million, one hundred eighty thousand, six hundred sixty-one".

Divisors: 1 421 95441 40180661