1561872 has 40 divisors (see below), whose sum is σ = 4346944. Its totient is φ = 480384.

The previous prime is 1561829. The next prime is 1561883. The reversal of 1561872 is 2781651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628 + ... + 1875.

2^1561872 is an apocalyptic number.

1561872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561872 is an abundant number, since it is smaller than the sum of its proper divisors (2785072).

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

1561872 is a wasteful number, since it uses less digits than its factorization.

1561872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527 (or 2521 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 1561872 is about 1249.7487747544. The cubic root of 1561872 is about 116.0241725289.

The spelling of 1561872 in words is "one million, five hundred sixty-one thousand, eight hundred seventy-two".