19139880 has 32 divisors (see below), whose sum is σ = 57420000. Its totient is φ = 5103936.

The previous prime is 19139863. The next prime is 19139891. The reversal of 19139880 is 8893191.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79630 + ... + 79869.

It is an arithmetic number, because the mean of its divisors is an integer number (1794375).

Almost surely, 2^19139880 is an apocalyptic number.

19139880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19139880 is an abundant number, since it is smaller than the sum of its proper divisors (38280120).

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

19139880 is a wasteful number, since it uses less digits than its factorization.

19139880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159513 (or 159509 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 19139880 is about 4374.9148563143. The cubic root of 19139880 is about 267.4933995518.

The spelling of 19139880 in words is "nineteen million, one hundred thirty-nine thousand, eight hundred eighty".