40680257 has 4 divisors (see below), whose sum is σ = 40693296. Its totient is φ = 40667220.

The previous prime is 40680251. The next prime is 40680271. The reversal of 40680257 is 75208604.

40680257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40680257 - 2⁸ = 40680001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40680251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238 + ... + 9104.

It is an arithmetic number, because the mean of its divisors is an integer number (10173324).

Almost surely, 2^40680257 is an apocalyptic number.

It is an amenable number.

40680257 is a deficient number, since it is larger than the sum of its proper divisors (13039).

40680257 is an equidigital number, since it uses as much as digits as its factorization.

40680257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13038.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 40680257 is about 6378.1076347142. The cubic root of 40680257 is about 343.9230070388.

The spelling of 40680257 in words is "forty million, six hundred eighty thousand, two hundred fifty-seven".