40556690 has 8 divisors (see below), whose sum is σ = 73002060. Its totient is φ = 16222672.

The previous prime is 40556689. The next prime is 40556701. The reversal of 40556690 is 9665504.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33304441 + 7252249 = 5771^2 + 2693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×40556690² = 3289690207512200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40556690.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027825 + ... + 2027844.

Almost surely, 2^40556690 is an apocalyptic number.

40556690 is a deficient number, since it is larger than the sum of its proper divisors (32445370).

40556690 is a wasteful number, since it uses less digits than its factorization.

40556690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055676.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 40556690 is about 6368.4134601956. The cubic root of 40556690 is about 343.5744297919.

The spelling of 40556690 in words is "forty million, five hundred fifty-six thousand, six hundred ninety".