16861959 has 8 divisors (see below), whose sum is σ = 24980720. Its totient is φ = 11241288.

The previous prime is 16861939. The next prime is 16861981. The reversal of 16861959 is 95916861.

It is not a de Polignac number, because 16861959 - 2⁹ = 16861447 is a prime.

It is a super-2 number, since 2×16861959² = 568651322635362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312232 + ... + 312285.

It is an arithmetic number, because the mean of its divisors is an integer number (3122590).

Almost surely, 2^16861959 is an apocalyptic number.

16861959 is a deficient number, since it is larger than the sum of its proper divisors (8118761).

16861959 is an equidigital number, since it uses as much as digits as its factorization.

16861959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624526 (or 624520 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 16861959 is about 4106.3315745322. The cubic root of 16861959 is about 256.4303015031.

The spelling of 16861959 in words is "sixteen million, eight hundred sixty-one thousand, nine hundred fifty-nine".