15381998 has 8 divisors (see below), whose sum is σ = 23090160. Its totient is φ = 7685280.

The previous prime is 15381979. The next prime is 15382013. The reversal of 15381998 is 89918351.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2543 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (2886270).

Almost surely, 2^15381998 is an apocalyptic number.

15381998 is a deficient number, since it is larger than the sum of its proper divisors (7708162).

15381998 is a wasteful number, since it uses less digits than its factorization.

15381998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722.

The product of its digits is 77760, while the sum is 44.

The square root of 15381998 is about 3921.9890361907. The cubic root of 15381998 is about 248.6972121010.

The spelling of 15381998 in words is "fifteen million, three hundred eighty-one thousand, nine hundred ninety-eight".