15380991 has 24 divisors (see below), whose sum is σ = 23736960. Its totient is φ = 9576000.

The previous prime is 15380983. The next prime is 15380993. The reversal of 15380991 is 19908351.

It is a happy number.

It is not a de Polignac number, because 15380991 - 2³ = 15380983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15380993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7141 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (989040).

Almost surely, 2^15380991 is an apocalyptic number.

15380991 is a deficient number, since it is larger than the sum of its proper divisors (8355969).

15380991 is a wasteful number, since it uses less digits than its factorization.

15380991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 15380991 is about 3921.8606553523. The cubic root of 15380991 is about 248.6917849006.

The spelling of 15380991 in words is "fifteen million, three hundred eighty thousand, nine hundred ninety-one".