15978946 has 8 divisors (see below), whose sum is σ = 25378380. Its totient is φ = 7519488.

The previous prime is 15978923. The next prime is 15978967. The reversal of 15978946 is 64987951.

It can be written as a sum of positive squares in 2 ways, for example, as 13402921 + 2576025 = 3661^2 + 1605^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 15978946.

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, 234951 + ... + 235018.

Almost surely, 2^15978946 is an apocalyptic number.

15978946 is a deficient number, since it is larger than the sum of its proper divisors (9399434).

15978946 is a wasteful number, since it uses less digits than its factorization.

15978946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469988.

The product of its digits is 544320, while the sum is 49.

The square root of 15978946 is about 3997.3673836664. The cubic root of 15978946 is about 251.8736348897.

The spelling of 15978946 in words is "fifteen million, nine hundred seventy-eight thousand, nine hundred forty-six".