15381900 has 126 divisors (see below), whose sum is σ = 50282372. Its totient is φ = 4082400.

The previous prime is 15381893. The next prime is 15381911. The reversal of 15381900 is 918351.

It is a super-2 number, since 2×15381900² = 473205695220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 41 ways as a sum of consecutive naturals, for example, 72795 + ... + 73005.

Almost surely, 2^15381900 is an apocalyptic number.

15381900 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 15381900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25141186).

15381900 is an abundant number, since it is smaller than the sum of its proper divisors (34900472).

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

15381900 is a wasteful number, since it uses less digits than its factorization.

15381900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 15381900 is about 3921.9765425102. The cubic root of 15381900 is about 248.6966839429.

The spelling of 15381900 in words is "fifteen million, three hundred eighty-one thousand, nine hundred".