15381993 has 8 divisors (see below), whose sum is σ = 22373856. Its totient is φ = 9322400.

The previous prime is 15381979. The next prime is 15382013. The reversal of 15381993 is 39918351.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15381993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15381913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233028 + ... + 233093.

It is an arithmetic number, because the mean of its divisors is an integer number (2796732).

Almost surely, 2^15381993 is an apocalyptic number.

It is an amenable number.

15381993 is a deficient number, since it is larger than the sum of its proper divisors (6991863).

15381993 is a wasteful number, since it uses less digits than its factorization.

15381993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466135.

The product of its digits is 29160, while the sum is 39.

The square root of 15381993 is about 3921.9883987590. The cubic root of 15381993 is about 248.6971851542.

The spelling of 15381993 in words is "fifteen million, three hundred eighty-one thousand, nine hundred ninety-three".