556389540 has 384 divisors, whose sum is σ = 2133196800. Its totient is φ = 117573120.

The previous prime is 556389539. The next prime is 556389551. The reversal of 556389540 is 45983655.

556389540 is a `hidden beast` number, since 5 + 5 + 638 + 9 + 5 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4380957 + ... + 4381083.

It is an arithmetic number, because the mean of its divisors is an integer number (5555200).

Almost surely, 2^556389540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556389540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066598400).

556389540 is an abundant number, since it is smaller than the sum of its proper divisors (1576807260).

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

556389540 is a wasteful number, since it uses less digits than its factorization.

556389540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The square root of 556389540 is about 23587.9108867233. The cubic root of 556389540 is about 822.4818422774.

The spelling of 556389540 in words is "five hundred fifty-six million, three hundred eighty-nine thousand, five hundred forty".