15798861 has 64 divisors (see below), whose sum is σ = 27955200. Its totient is φ = 8724672.

The previous prime is 15798859. The next prime is 15798863. The reversal of 15798861 is 16889751.

It is an interprime number because it is at equal distance from previous prime (15798859) and next prime (15798863).

It is not a de Polignac number, because 15798861 - 2¹ = 15798859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15798863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153336 + ... + 153438.

It is an arithmetic number, because the mean of its divisors is an integer number (436800).

Almost surely, 2^15798861 is an apocalyptic number.

It is an amenable number.

15798861 is a deficient number, since it is larger than the sum of its proper divisors (12156339).

15798861 is a wasteful number, since it uses less digits than its factorization.

15798861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 161 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 15798861 is about 3974.7781070143. The cubic root of 15798861 is about 250.9238405361.

It can be divided in two parts, 1579 and 8861, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 15798861 in words is "fifteen million, seven hundred ninety-eight thousand, eight hundred sixty-one".