40398656 has 14 divisors (see below), whose sum is σ = 80166210. Its totient is φ = 20199296.

The previous prime is 40398643. The next prime is 40398661. The reversal of 40398656 is 65689304.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 11669056 = 5360^2 + 3416^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315551 + ... + 315678.

Almost surely, 2^40398656 is an apocalyptic number.

It is an amenable number.

40398656 is a deficient number, since it is larger than the sum of its proper divisors (39767554).

40398656 is an equidigital number, since it uses as much as digits as its factorization.

40398656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631241 (or 631231 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 40398656 is about 6355.9937067307. The cubic root of 40398656 is about 343.1275892607.

The spelling of 40398656 in words is "forty million, three hundred ninety-eight thousand, six hundred fifty-six".