15978238 has 16 divisors (see below), whose sum is σ = 25174656. Its totient is φ = 7591320.

The previous prime is 15978223. The next prime is 15978239. The reversal of 15978238 is 83287951.

It is a junction number, because it is equal to n+sod(n) for n = 15978194 and 15978203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15978239) 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, 6433 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (1573416).

Almost surely, 2^15978238 is an apocalyptic number.

15978238 is a deficient number, since it is larger than the sum of its proper divisors (9196418).

15978238 is a wasteful number, since it uses less digits than its factorization.

15978238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its digits is 120960, while the sum is 43.

The square root of 15978238 is about 3997.2788244004. The cubic root of 15978238 is about 251.8699148035.

The spelling of 15978238 in words is "fifteen million, nine hundred seventy-eight thousand, two hundred thirty-eight".