15481920 has 56 divisors (see below), whose sum is σ = 49158144. Its totient is φ = 4128256.

The previous prime is 15481901. The next prime is 15481933. The reversal of 15481920 is 2918451.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7104 + ... + 9023.

It is an arithmetic number, because the mean of its divisors is an integer number (877824).

Almost surely, 2^15481920 is an apocalyptic number.

15481920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15481920 is an abundant number, since it is smaller than the sum of its proper divisors (33676224).

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

15481920 is a wasteful number, since it uses less digits than its factorization.

15481920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16147 (or 16137 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 15481920 is about 3934.7071047284. The cubic root of 15481920 is about 249.2345654986.

The spelling of 15481920 in words is "fifteen million, four hundred eighty-one thousand, nine hundred twenty".