15891140 has 12 divisors (see below), whose sum is σ = 33371436. Its totient is φ = 6356448.

The previous prime is 15891133. The next prime is 15891143. The reversal of 15891140 is 4119851.

It can be written as a sum of positive squares in 2 ways, for example, as 12334144 + 3556996 = 3512^2 + 1886^2 .

It is not an unprimeable number, because it can be changed into a prime (15891143) 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 3 ways as a sum of consecutive naturals, for example, 397259 + ... + 397298.

It is an arithmetic number, because the mean of its divisors is an integer number (2780953).

Almost surely, 2^15891140 is an apocalyptic number.

15891140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15891140 is an abundant number, since it is smaller than the sum of its proper divisors (17480296).

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

15891140 is a wasteful number, since it uses less digits than its factorization.

15891140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794566 (or 794564 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 15891140 is about 3986.3692754184. The cubic root of 15891140 is about 251.4114298010.

The spelling of 15891140 in words is "fifteen million, eight hundred ninety-one thousand, one hundred forty".