40656442 has 4 divisors (see below), whose sum is σ = 60984666. Its totient is φ = 20328220.

The previous prime is 40656389. The next prime is 40656443. The reversal of 40656442 is 24465604.

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

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 6305121 = 5861^2 + 2511^2 .

It is not an unprimeable number, because it can be changed into a prime (40656443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164109 + ... + 10164112.

Almost surely, 2^40656442 is an apocalyptic number.

40656442 is a deficient number, since it is larger than the sum of its proper divisors (20328224).

40656442 is a wasteful number, since it uses less digits than its factorization.

40656442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20328223.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 40656442 is about 6376.2404283402. The cubic root of 40656442 is about 343.8558809042.

The spelling of 40656442 in words is "forty million, six hundred fifty-six thousand, four hundred forty-two".