40566731 has 4 divisors (see below), whose sum is σ = 40581552. Its totient is φ = 40551912.

The previous prime is 40566727. The next prime is 40566749. The reversal of 40566731 is 13766504.

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

It is a cyclic number.

It is not a de Polignac number, because 40566731 - 2² = 40566727 is a prime.

It is a super-2 number, since 2×40566731² = 3291319328052722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40536731) 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, 1976 + ... + 9221.

It is an arithmetic number, because the mean of its divisors is an integer number (10145388).

Almost surely, 2^40566731 is an apocalyptic number.

40566731 is a deficient number, since it is larger than the sum of its proper divisors (14821).

40566731 is a wasteful number, since it uses less digits than its factorization.

40566731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14820.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 40566731 is about 6369.2017553222. The cubic root of 40566731 is about 343.6027814332.

The spelling of 40566731 in words is "forty million, five hundred sixty-six thousand, seven hundred thirty-one".