40681057 has 4 divisors (see below), whose sum is σ = 40720816. Its totient is φ = 40641300.

The previous prime is 40681037. The next prime is 40681063. The reversal of 40681057 is 75018604.

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 2^k-40681057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40681027) 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, 18303 + ... + 20404.

It is an arithmetic number, because the mean of its divisors is an integer number (10180204).

Almost surely, 2^40681057 is an apocalyptic number.

It is an amenable number.

40681057 is a deficient number, since it is larger than the sum of its proper divisors (39759).

40681057 is a wasteful number, since it uses less digits than its factorization.

40681057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39758.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 40681057 is about 6378.1703489324. The cubic root of 40681057 is about 343.9252615035.

The spelling of 40681057 in words is "forty million, six hundred eighty-one thousand, fifty-seven".