978671138 has 4 divisors (see below), whose sum is σ = 1468006710. Its totient is φ = 489335568.

The previous prime is 978671123. The next prime is 978671143. The reversal of 978671138 is 831176879.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 678446209 + 300224929 = 26047^2 + 17327^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244667783 + ... + 244667786.

Almost surely, 2^978671138 is an apocalyptic number.

978671138 is a deficient number, since it is larger than the sum of its proper divisors (489335572).

978671138 is a wasteful number, since it uses less digits than its factorization.

978671138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489335571.

The product of its digits is 508032, while the sum is 50.

The square root of 978671138 is about 31283.7200153690. The cubic root of 978671138 is about 992.8392250288.

The spelling of 978671138 in words is "nine hundred seventy-eight million, six hundred seventy-one thousand, one hundred thirty-eight".