1978867392 has 56 divisors (see below), whose sum is σ = 5404664832. Its totient is φ = 638342400.

The previous prime is 1978867379. The next prime is 1978867409. The reversal of 1978867392 is 2937688791.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160284 + ... + 172187.

It is an arithmetic number, because the mean of its divisors is an integer number (96511872).

Almost surely, 2^1978867392 is an apocalyptic number.

1978867392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1978867392 is an abundant number, since it is smaller than the sum of its proper divisors (3425797440).

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

1978867392 is a wasteful number, since it uses less digits than its factorization.

1978867392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332517 (or 332507 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 60.

The square root of 1978867392 is about 44484.4623660891. The cubic root of 1978867392 is about 1255.4677583157.

The spelling of 1978867392 in words is "one billion, nine hundred seventy-eight million, eight hundred sixty-seven thousand, three hundred ninety-two".