15138819 has 20 divisors (see below), whose sum is σ = 23348160. Its totient is φ = 9765360.

The previous prime is 15138793. The next prime is 15138821. The reversal of 15138819 is 91883151.

It is not a de Polignac number, because 15138819 - 2¹⁵ = 15106051 is a prime.

It is a super-2 number, since 2×15138819² = 458367681429522, which contains 22 as substring.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (15138719) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 504 + ... + 5525.

It is an arithmetic number, because the mean of its divisors is an integer number (1167408).

Almost surely, 2^15138819 is an apocalyptic number.

15138819 is a deficient number, since it is larger than the sum of its proper divisors (8209341).

15138819 is an equidigital number, since it uses as much as digits as its factorization.

15138819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6072 (or 6063 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 15138819 is about 3890.8635288326. The cubic root of 15138819 is about 247.3796660213.

The spelling of 15138819 in words is "fifteen million, one hundred thirty-eight thousand, eight hundred nineteen".