15981330 has 32 divisors (see below), whose sum is σ = 39009600. Its totient is φ = 4188992.

The previous prime is 15981323. The next prime is 15981341. The reversal of 15981330 is 3318951.

It is a happy number.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2745 + ... + 6284.

It is an arithmetic number, because the mean of its divisors is an integer number (1219050).

Almost surely, 2^15981330 is an apocalyptic number.

15981330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15981330 is an abundant number, since it is smaller than the sum of its proper divisors (23028270).

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

15981330 is a wasteful number, since it uses less digits than its factorization.

15981330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9098.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 15981330 is about 3997.6655688039. The cubic root of 15981330 is about 251.8861604736.

The spelling of 15981330 in words is "fifteen million, nine hundred eighty-one thousand, three hundred thirty".