40656121 has 12 divisors (see below), whose sum is σ = 44886436. Its totient is φ = 36796320.

The previous prime is 40656107. The next prime is 40656149. The reversal of 40656121 is 12165604.

It can be written as a sum of positive squares in 2 ways, for example, as 3920400 + 36735721 = 1980^2 + 6061^2 .

It is not a de Polignac number, because 40656121 - 2⁵ = 40656089 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40656101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32911 + ... + 34123.

Almost surely, 2^40656121 is an apocalyptic number.

It is an amenable number.

40656121 is a deficient number, since it is larger than the sum of its proper divisors (4230315).

40656121 is a wasteful number, since it uses less digits than its factorization.

40656121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 40656121 is about 6376.2152567177. The cubic root of 40656121 is about 343.8549759387.

The spelling of 40656121 in words is "forty million, six hundred fifty-six thousand, one hundred twenty-one".