15381797 has 4 divisors (see below), whose sum is σ = 15878016. Its totient is φ = 14885580.

The previous prime is 15381767. The next prime is 15381799. The reversal of 15381797 is 79718351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79718351 = 983 ⋅81097.

It is not a de Polignac number, because 15381797 - 2¹⁸ = 15119653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15381799) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 248063 + ... + 248124.

It is an arithmetic number, because the mean of its divisors is an integer number (3969504).

Almost surely, 2^15381797 is an apocalyptic number.

It is an amenable number.

15381797 is a deficient number, since it is larger than the sum of its proper divisors (496219).

15381797 is an equidigital number, since it uses as much as digits as its factorization.

15381797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496218.

The product of its digits is 52920, while the sum is 41.

The square root of 15381797 is about 3921.9634113541. The cubic root of 15381797 is about 248.6961288356.

The spelling of 15381797 in words is "fifteen million, three hundred eighty-one thousand, seven hundred ninety-seven".