1561830 has 32 divisors (see below), whose sum is σ = 3801600. Its totient is φ = 410592.

The previous prime is 1561829. The next prime is 1561883. The reversal of 1561830 is 381651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561830.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2041 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (118800).

2^1561830 is an apocalyptic number.

1561830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561830 is an abundant number, since it is smaller than the sum of its proper divisors (2239770).

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

1561830 is a wasteful number, since it uses less digits than its factorization.

1561830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1561830 is about 1249.7319712642. The cubic root of 1561830 is about 116.0231325250.

The spelling of 1561830 in words is "one million, five hundred sixty-one thousand, eight hundred thirty".