15291990 has 192 divisors, whose sum is σ = 50319360. Its totient is φ = 3265920.

The previous prime is 15291973. The next prime is 15292007. The reversal of 15291990 is 9919251.

It is an interprime number because it is at equal distance from previous prime (15291973) and next prime (15292007).

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 95 ways as a sum of consecutive naturals, for example, 493275 + ... + 493305.

It is an arithmetic number, because the mean of its divisors is an integer number (262080).

Almost surely, 2^15291990 is an apocalyptic number.

15291990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15291990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25159680).

15291990 is an abundant number, since it is smaller than the sum of its proper divisors (35027370).

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

15291990 is a wasteful number, since it uses less digits than its factorization.

15291990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 15291990 is about 3910.4974108162. The cubic root of 15291990 is about 248.2111776533.

The spelling of 15291990 in words is "fifteen million, two hundred ninety-one thousand, nine hundred ninety".