15378969 has 4 divisors (see below), whose sum is σ = 20505296. Its totient is φ = 10252644.

The previous prime is 15378959. The next prime is 15378971. The reversal of 15378969 is 96987351.

15378969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 96987351 = 3 ⋅32329117.

It is not a de Polignac number, because 15378969 - 2⁹ = 15378457 is a prime.

It is a super-2 number, since 2×15378969² = 473025375005922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15378929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2563159 + ... + 2563164.

It is an arithmetic number, because the mean of its divisors is an integer number (5126324).

Almost surely, 2^15378969 is an apocalyptic number.

It is an amenable number.

15378969 is a deficient number, since it is larger than the sum of its proper divisors (5126327).

15378969 is an equidigital number, since it uses as much as digits as its factorization.

15378969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126326.

The product of its digits is 408240, while the sum is 48.

The square root of 15378969 is about 3921.6028610761. The cubic root of 15378969 is about 248.6808866685.

The spelling of 15378969 in words is "fifteen million, three hundred seventy-eight thousand, nine hundred sixty-nine".