19139039940 has 48 divisors (see below), whose sum is σ = 53602069248. Its totient is φ = 5102529024.

The previous prime is 19139039923. The next prime is 19139039957. The reversal of 19139039940 is 4993093191.

It is an interprime number because it is at equal distance from previous prime (19139039923) and next prime (19139039957).

It is a self number, because there is not a number n which added to its sum of digits gives 19139039940.

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, 232044 + ... + 303516.

It is an arithmetic number, because the mean of its divisors is an integer number (1116709776).

Almost surely, 2^19139039940 is an apocalyptic number.

19139039940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19139039940 is an abundant number, since it is smaller than the sum of its proper divisors (34463029308).

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

19139039940 is a wasteful number, since it uses less digits than its factorization.

19139039940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75948 (or 75946 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 48.

The spelling of 19139039940 in words is "nineteen billion, one hundred thirty-nine million, thirty-nine thousand, nine hundred forty".