1978844136 has 16 divisors (see below), whose sum is σ = 4947110400. Its totient is φ = 659614704.

The previous prime is 1978844113. The next prime is 1978844141. The reversal of 1978844136 is 6314488791.

It is a super-2 number, since 2×1978844136² = 7831648229163172992, which contains 22 as substring.

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, 41225896 + ... + 41225943.

It is an arithmetic number, because the mean of its divisors is an integer number (309194400).

Almost surely, 2^1978844136 is an apocalyptic number.

It is an amenable number.

1978844136 is an abundant number, since it is smaller than the sum of its proper divisors (2968266264).

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

1978844136 is a wasteful number, since it uses less digits than its factorization.

1978844136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82451848 (or 82451844 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 1978844136 is about 44484.2009706817. The cubic root of 1978844136 is about 1255.4628401367.

The spelling of 1978844136 in words is "one billion, nine hundred seventy-eight million, eight hundred forty-four thousand, one hundred thirty-six".