15399955 has 8 divisors (see below), whose sum is σ = 18979632. Its totient is φ = 11986848.

The previous prime is 15399947. The next prime is 15399959. The reversal of 15399955 is 55999351.

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

It is a cyclic number.

It is not a de Polignac number, because 15399955 - 2³ = 15399947 is a prime.

It is a super-2 number, since 2×15399955² = 474317228004050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15399959) 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, 41437 + ... + 41806.

It is an arithmetic number, because the mean of its divisors is an integer number (2372454).

Almost surely, 2^15399955 is an apocalyptic number.

15399955 is a deficient number, since it is larger than the sum of its proper divisors (3579677).

15399955 is an equidigital number, since it uses as much as digits as its factorization.

15399955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83285.

The product of its digits is 273375, while the sum is 46.

The square root of 15399955 is about 3924.2776405346. The cubic root of 15399955 is about 248.7939511407.

The spelling of 15399955 in words is "fifteen million, three hundred ninety-nine thousand, nine hundred fifty-five".