15978242 has 8 divisors (see below), whose sum is σ = 27391296. Its totient is φ = 6847812.

The previous prime is 15978239. The next prime is 15978253. The reversal of 15978242 is 24287951.

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

It is a junction number, because it is equal to n+sod(n) for n = 15978196 and 15978205.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 570638 + ... + 570665.

It is an arithmetic number, because the mean of its divisors is an integer number (3423912).

Almost surely, 2^15978242 is an apocalyptic number.

15978242 is a deficient number, since it is larger than the sum of its proper divisors (11413054).

15978242 is a wasteful number, since it uses less digits than its factorization.

15978242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141312.

The product of its digits is 40320, while the sum is 38.

The square root of 15978242 is about 3997.2793247408. The cubic root of 15978242 is about 251.8699358213.

The spelling of 15978242 in words is "fifteen million, nine hundred seventy-eight thousand, two hundred forty-two".