15978396 has 48 divisors (see below), whose sum is σ = 42850304. Its totient is φ = 4539456.

The previous prime is 15978383. The next prime is 15978421. The reversal of 15978396 is 69387951.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18306 + ... + 19158.

Almost surely, 2^15978396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15978396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21425152).

15978396 is an abundant number, since it is smaller than the sum of its proper divisors (26871908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15978396 is a wasteful number, since it uses less digits than its factorization.

15978396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1088 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 15978396 is about 3997.2985877965. The cubic root of 15978396 is about 251.8707450018.

The spelling of 15978396 in words is "fifteen million, nine hundred seventy-eight thousand, three hundred ninety-six".