1556137242 has 48 divisors (see below), whose sum is σ = 3705054912. Its totient is φ = 468106560.

The previous prime is 1556137207. The next prime is 1556137291. The reversal of 1556137242 is 2427316551.

1556137242 is a `hidden beast` number, since 15 + 5 + 613 + 7 + 24 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1556137197 and 1556137206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1558 + ... + 55809.

It is an arithmetic number, because the mean of its divisors is an integer number (77188644).

Almost surely, 2^1556137242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556137242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1852527456).

1556137242 is an abundant number, since it is smaller than the sum of its proper divisors (2148917670).

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

1556137242 is a wasteful number, since it uses less digits than its factorization.

1556137242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57523 (or 57520 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 1556137242 is about 39447.9054196798. The cubic root of 1556137242 is about 1158.8199558384.

The spelling of 1556137242 in words is "one billion, five hundred fifty-six million, one hundred thirty-seven thousand, two hundred forty-two".