19139999 has 2 divisors, whose sum is σ = 19140000. Its totient is φ = 19139998.

The previous prime is 19139987. The next prime is 19140059. The reversal of 19139999 is 99993191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19139999 - 2⁴ = 19139983 is a prime.

It is a Chen prime.

19139999 is a modest number, since divided by 9999 gives 1913 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19132999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569999 + 9570000.

It is an arithmetic number, because the mean of its divisors is an integer number (9570000).

Almost surely, 2^19139999 is an apocalyptic number.

19139999 is a deficient number, since it is larger than the sum of its proper divisors (1).

19139999 is an equidigital number, since it uses as much as digits as its factorization.

19139999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 177147, while the sum is 50.

The square root of 19139999 is about 4374.9284565579. The cubic root of 19139999 is about 267.4939539205.

The spelling of 19139999 in words is "nineteen million, one hundred thirty-nine thousand, nine hundred ninety-nine".