1561930 has 16 divisors (see below), whose sum is σ = 2934144. Its totient is φ = 597520.

The previous prime is 1561919. The next prime is 1562051. The reversal of 1561930 is 391651.

It is a junction number, because it is equal to n+sod(n) for n = 1561895 and 1561904.

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, 3166 + ... + 3625.

It is an arithmetic number, because the mean of its divisors is an integer number (183384).

2^1561930 is an apocalyptic number.

1561930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561930 is a deficient number, since it is larger than the sum of its proper divisors (1372214).

1561930 is a wasteful number, since it uses less digits than its factorization.

1561930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1561930 is about 1249.7719792026. The cubic root of 1561930 is about 116.0256086941.

The spelling of 1561930 in words is "one million, five hundred sixty-one thousand, nine hundred thirty".