15881940 has 48 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 4235040.

The previous prime is 15881869. The next prime is 15881959. The reversal of 15881940 is 4918851.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 15881895 and 15881904.

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, 14166 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (1029420).

Almost surely, 2^15881940 is an apocalyptic number.

15881940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15881940 is an abundant number, since it is smaller than the sum of its proper divisors (33530220).

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

15881940 is a wasteful number, since it uses less digits than its factorization.

15881940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29429 (or 29421 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 15881940 is about 3985.2151761229. The cubic root of 15881940 is about 251.3629031449.

The spelling of 15881940 in words is "fifteen million, eight hundred eighty-one thousand, nine hundred forty".