400609656 has 48 divisors (see below), whose sum is σ = 1114315800. Its totient is φ = 129926592.

The previous prime is 400609637. The next prime is 400609663. The reversal of 400609656 is 656906004.

It is a happy number.

400609656 is a `hidden beast` number, since 40 + 0 + 609 + 6 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 400609656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72526 + ... + 77853.

Almost surely, 2^400609656 is an apocalyptic number.

It is an amenable number.

400609656 is an abundant number, since it is smaller than the sum of its proper divisors (713706144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400609656 is a wasteful number, since it uses less digits than its factorization.

400609656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150428 (or 150421 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 400609656 is about 20015.2355969147. The cubic root of 400609656 is about 737.1804416954.

The spelling of 400609656 in words is "four hundred million, six hundred nine thousand, six hundred fifty-six".