19139870 has 32 divisors (see below), whose sum is σ = 35356608. Its totient is φ = 7458048.

The previous prime is 19139863. The next prime is 19139891. The reversal of 19139870 is 7893191.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114527 + ... + 114693.

It is an arithmetic number, because the mean of its divisors is an integer number (1104894).

Almost surely, 2^19139870 is an apocalyptic number.

19139870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19139870 is a deficient number, since it is larger than the sum of its proper divisors (16216738).

19139870 is a wasteful number, since it uses less digits than its factorization.

19139870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 19139870 is about 4374.9137134348. The cubic root of 19139870 is about 267.4933529661.

The spelling of 19139870 in words is "nineteen million, one hundred thirty-nine thousand, eight hundred seventy".