15115890 has 64 divisors (see below), whose sum is σ = 38911104. Its totient is φ = 3744768.

The previous prime is 15115871. The next prime is 15115913. The reversal of 15115890 is 9851151.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54432 + ... + 54708.

It is an arithmetic number, because the mean of its divisors is an integer number (607986).

Almost surely, 2^15115890 is an apocalyptic number.

15115890 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 15115890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19455552).

15115890 is an abundant number, since it is smaller than the sum of its proper divisors (23795214).

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

15115890 is a wasteful number, since it uses less digits than its factorization.

15115890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its (nonzero) digits is 1800, while the sum is 30.

The square root of 15115890 is about 3887.9158941520. The cubic root of 15115890 is about 247.2547105578.

The spelling of 15115890 in words is "fifteen million, one hundred fifteen thousand, eight hundred ninety".