15978255 has 8 divisors (see below), whose sum is σ = 25565232. Its totient is φ = 8521728.

The previous prime is 15978253. The next prime is 15978269. The reversal of 15978255 is 55287951.

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

It is not a de Polignac number, because 15978255 - 2¹ = 15978253 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15978253) 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, 532594 + ... + 532623.

It is an arithmetic number, because the mean of its divisors is an integer number (3195654).

Almost surely, 2^15978255 is an apocalyptic number.

15978255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15978255 is a deficient number, since it is larger than the sum of its proper divisors (9586977).

15978255 is a wasteful number, since it uses less digits than its factorization.

15978255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065225.

The product of its digits is 126000, while the sum is 42.

The square root of 15978255 is about 3997.2809508465. The cubic root of 15978255 is about 251.8700041289.

The spelling of 15978255 in words is "fifteen million, nine hundred seventy-eight thousand, two hundred fifty-five".