15379920 has 120 divisors (see below), whose sum is σ = 53012232. Its totient is φ = 3993600.

The previous prime is 15379913. The next prime is 15379921. The reversal of 15379920 is 2997351.

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 15303744 = 276^2 + 3912^2 .

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15379921) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 29260 + ... + 29780.

Almost surely, 2^15379920 is an apocalyptic number.

15379920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15379920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26506116).

15379920 is an abundant number, since it is smaller than the sum of its proper divisors (37632312).

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

15379920 is a wasteful number, since it uses less digits than its factorization.

15379920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 15379920 is about 3921.7241106432. The cubic root of 15379920 is about 248.6860125139.

The spelling of 15379920 in words is "fifteen million, three hundred seventy-nine thousand, nine hundred twenty".