556400621 has 16 divisors (see below), whose sum is σ = 650858880. Its totient is φ = 465791040.

The previous prime is 556400597. The next prime is 556400639. The reversal of 556400621 is 126004655.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556400621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556400681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60551 + ... + 69131.

It is an arithmetic number, because the mean of its divisors is an integer number (40678680).

Almost surely, 2^556400621 is an apocalyptic number.

It is an amenable number.

556400621 is a deficient number, since it is larger than the sum of its proper divisors (94458259).

556400621 is a wasteful number, since it uses less digits than its factorization.

556400621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8804.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 556400621 is about 23588.1457728241. The cubic root of 556400621 is about 822.4873023973.

The spelling of 556400621 in words is "five hundred fifty-six million, four hundred thousand, six hundred twenty-one".