1978895936 has 14 divisors (see below), whose sum is σ = 3926871750. Its totient is φ = 989447936.

The previous prime is 1978895911. The next prime is 1978895951. The reversal of 1978895936 is 6395988791.

It can be written as a sum of positive squares in only one way, i.e., 1976335936 + 2560000 = 44456^2 + 1600^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15460061 + ... + 15460188.

Almost surely, 2^1978895936 is an apocalyptic number.

1978895936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1978895936 is a deficient number, since it is larger than the sum of its proper divisors (1947975814).

1978895936 is an equidigital number, since it uses as much as digits as its factorization.

1978895936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30920261 (or 30920251 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 65.

The square root of 1978895936 is about 44484.7831960548. The cubic root of 1978895936 is about 1255.4737947484.

The spelling of 1978895936 in words is "one billion, nine hundred seventy-eight million, eight hundred ninety-five thousand, nine hundred thirty-six".