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40020001 = 75717143
BaseRepresentation
bin1001100010101…
…0100000100001
32210022020010021
42120222200201
540221120001
63545433441
7664110250
oct230524041
983266107
1040020001
112065468a
121149b881
1383a2998
14545a797
1537a7ba1
hex262a821

40020001 has 4 divisors (see below), whose sum is σ = 45737152. Its totient is φ = 34302852.

The previous prime is 40019981. The next prime is 40020011. The reversal of 40020001 is 10002004.

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 not a de Polignac number, because 40020001 - 29 = 40019489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 5717143 = 40020001 / (4 + 0 + 0 + 2 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40020011) 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, 2858565 + ... + 2858578.

It is an arithmetic number, because the mean of its divisors is an integer number (11434288).

Almost surely, 240020001 is an apocalyptic number.

It is an amenable number.

40020001 is a deficient number, since it is larger than the sum of its proper divisors (5717151).

40020001 is an equidigital number, since it uses as much as digits as its factorization.

40020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5717150.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 40020001 is about 6326.1363406111. The cubic root of 40020001 is about 342.0521818853.

Adding to 40020001 its reverse (10002004), we get a palindrome (50022005).

The spelling of 40020001 in words is "forty million, twenty thousand, one".

Divisors: 1 7 5717143 40020001