15117993 has 24 divisors (see below), whose sum is σ = 24136320. Its totient is φ = 9041760.

The previous prime is 15117989. The next prime is 15117997. The reversal of 15117993 is 39971151.

It is an interprime number because it is at equal distance from previous prime (15117989) and next prime (15117997).

It is not a de Polignac number, because 15117993 - 2² = 15117989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15117997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6855 + ... + 8787.

It is an arithmetic number, because the mean of its divisors is an integer number (1005680).

Almost surely, 2^15117993 is an apocalyptic number.

It is an amenable number.

15117993 is a deficient number, since it is larger than the sum of its proper divisors (9018327).

15117993 is a wasteful number, since it uses less digits than its factorization.

15117993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2026 counting only the distinct ones).

The product of its digits is 8505, while the sum is 36.

The square root of 15117993 is about 3888.1863381273. The cubic root of 15117993 is about 247.2661764732.

It can be divided in two parts, 15117 and 993, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 15117993 in words is "fifteen million, one hundred seventeen thousand, nine hundred ninety-three".