15872881 has 6 divisors (see below), whose sum is σ = 15992870. Its totient is φ = 15753696.

The previous prime is 15872873. The next prime is 15872893. The reversal of 15872881 is 18827851.

It can be written as a sum of positive squares in 3 ways, for example, as 14561856 + 1311025 = 3816^2 + 1145^2 .

It is not a de Polignac number, because 15872881 - 2³ = 15872873 is a prime.

It is a super-2 number, since 2×15872881² = 503896702480322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15879881) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 38605 + ... + 39013.

Almost surely, 2^15872881 is an apocalyptic number.

It is an amenable number.

15872881 is a deficient number, since it is larger than the sum of its proper divisors (119989).

15872881 is an frugal number, since it uses more digits than its factorization.

15872881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 606 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 15872881 is about 3984.0784379829. The cubic root of 15872881 is about 251.3151018975.

The spelling of 15872881 in words is "fifteen million, eight hundred seventy-two thousand, eight hundred eighty-one".