19138807 has 2 divisors, whose sum is σ = 19138808. Its totient is φ = 19138806.

The previous prime is 19138781. The next prime is 19138843. The reversal of 19138807 is 70883191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19138807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19138877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569403 + 9569404.

It is an arithmetic number, because the mean of its divisors is an integer number (9569404).

Almost surely, 2^19138807 is an apocalyptic number.

19138807 is a deficient number, since it is larger than the sum of its proper divisors (1).

19138807 is an equidigital number, since it uses as much as digits as its factorization.

19138807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 19138807 is about 4374.7922236376. The cubic root of 19138807 is about 267.4884008130.

The spelling of 19138807 in words is "nineteen million, one hundred thirty-eight thousand, eight hundred seven".