19474840139 has 2 divisors, whose sum is σ = 19474840140. Its totient is φ = 19474840138.

The previous prime is 19474840123. The next prime is 19474840237. The reversal of 19474840139 is 93104847491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19474840139 - 2⁴ = 19474840123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19474840109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737420069 + 9737420070.

It is an arithmetic number, because the mean of its divisors is an integer number (9737420070).

Almost surely, 2^19474840139 is an apocalyptic number.

19474840139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19474840139 is an equidigital number, since it uses as much as digits as its factorization.

19474840139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 19474840139 in words is "nineteen billion, four hundred seventy-four million, eight hundred forty thousand, one hundred thirty-nine".