1561968 has 30 divisors (see below), whose sum is σ = 4371744. Its totient is φ = 520608.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561968 is 8691651.

1561968 is a `hidden beast` number, since 1 + 561 + 96 + 8 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5280 + ... + 5567.

2^1561968 is an apocalyptic number.

1561968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1561968 is an abundant number, since it is smaller than the sum of its proper divisors (2809776).

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

1561968 is a wasteful number, since it uses less digits than its factorization.

1561968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10861 (or 10852 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1561968 is about 1249.7871818834. The cubic root of 1561968 is about 116.0265496106.

The spelling of 1561968 in words is "one million, five hundred sixty-one thousand, nine hundred sixty-eight".