978639958 has 8 divisors (see below), whose sum is σ = 1492025040. Its totient is φ = 481298280.

The previous prime is 978639923. The next prime is 978639979. The reversal of 978639958 is 859936879.

It is a happy number.

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 978639958.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4010698 + ... + 4010941.

It is an arithmetic number, because the mean of its divisors is an integer number (186503130).

Almost surely, 2^978639958 is an apocalyptic number.

978639958 is a deficient number, since it is larger than the sum of its proper divisors (513385082).

978639958 is a wasteful number, since it uses less digits than its factorization.

978639958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8021702.

The product of its digits is 29393280, while the sum is 64.

The square root of 978639958 is about 31283.2216691312. The cubic root of 978639958 is about 992.8286811206.

The spelling of 978639958 in words is "nine hundred seventy-eight million, six hundred thirty-nine thousand, nine hundred fifty-eight".