19878964 has 12 divisors (see below), whose sum is σ = 39757984. Its totient is φ = 8519544.

The previous prime is 19878941. The next prime is 19878983. The reversal of 19878964 is 46987891.

It is a happy number.

19878964 is an admirable number.

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, 354954 + ... + 355009.

Almost surely, 2^19878964 is an apocalyptic number.

19878964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19878964 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19878964 is a wasteful number, since it uses less digits than its factorization.

19878964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709974 (or 709972 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 19878964 is about 4458.5831830302. The cubic root of 19878964 is about 270.8930829174.

The spelling of 19878964 in words is "nineteen million, eight hundred seventy-eight thousand, nine hundred sixty-four".