15381840 has 40 divisors (see below), whose sum is σ = 47684448. Its totient is φ = 4101760.

The previous prime is 15381833. The next prime is 15381851. The reversal of 15381840 is 4818351.

15381840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 15381798 and 15381807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31806 + ... + 32285.

Almost surely, 2^15381840 is an apocalyptic number.

15381840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15381840 is an abundant number, since it is smaller than the sum of its proper divisors (32302608).

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

15381840 is a wasteful number, since it uses less digits than its factorization.

15381840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64107 (or 64101 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 15381840 is about 3921.9688932984. The cubic root of 15381840 is about 248.6963605797.

The spelling of 15381840 in words is "fifteen million, three hundred eighty-one thousand, eight hundred forty".