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40852781 = 67609743
BaseRepresentation
bin1001101111010…
…1110100101101
32211212112110222
42123311310231
540424242111
64015341125
71004146214
oct233656455
984775428
1040852781
1121073332
12118217a5
138604a58
1455d607b
1538be7db
hex26f5d2d

40852781 has 4 divisors (see below), whose sum is σ = 41462592. Its totient is φ = 40242972.

The previous prime is 40852753. The next prime is 40852817. The reversal of 40852781 is 18725804.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-40852781 is a prime.

It is a super-2 number, since 2×408527812 = 3337899430867922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40852711) 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, 304805 + ... + 304938.

It is an arithmetic number, because the mean of its divisors is an integer number (10365648).

Almost surely, 240852781 is an apocalyptic number.

It is an amenable number.

40852781 is a deficient number, since it is larger than the sum of its proper divisors (609811).

40852781 is an equidigital number, since it uses as much as digits as its factorization.

40852781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609810.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 40852781 is about 6391.6180267597. The cubic root of 40852781 is about 344.4085111048.

The spelling of 40852781 in words is "forty million, eight hundred fifty-two thousand, seven hundred eighty-one".

Divisors: 1 67 609743 40852781