15243855 has 16 divisors (see below), whose sum is σ = 26607744. Its totient is φ = 7390880.

The previous prime is 15243827. The next prime is 15243857. The reversal of 15243855 is 55834251.

It is not a de Polignac number, because 15243855 - 2⁷ = 15243727 is a prime.

It is a super-2 number, since 2×15243855² = 464750230522050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15243857) 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 15 ways as a sum of consecutive naturals, for example, 46029 + ... + 46358.

It is an arithmetic number, because the mean of its divisors is an integer number (1662984).

Almost surely, 2^15243855 is an apocalyptic number.

15243855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15243855 is a deficient number, since it is larger than the sum of its proper divisors (11363889).

15243855 is a wasteful number, since it uses less digits than its factorization.

15243855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92406.

The product of its digits is 24000, while the sum is 33.

The square root of 15243855 is about 3904.3379720511. The cubic root of 15243855 is about 247.9504702943.

The spelling of 15243855 in words is "fifteen million, two hundred forty-three thousand, eight hundred fifty-five".