19139723 has 2 divisors, whose sum is σ = 19139724. Its totient is φ = 19139722.

The previous prime is 19139711. The next prime is 19139737. The reversal of 19139723 is 32793191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19139723 - 2¹⁰ = 19138699 is a prime.

It is not a weakly prime, because it can be changed into another prime (19132723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9569861 + 9569862.

It is an arithmetic number, because the mean of its divisors is an integer number (9569862).

Almost surely, 2^19139723 is an apocalyptic number.

19139723 is a deficient number, since it is larger than the sum of its proper divisors (1).

19139723 is an equidigital number, since it uses as much as digits as its factorization.

19139723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 35.

The square root of 19139723 is about 4374.8969130712. The cubic root of 19139723 is about 267.4926681544.

The spelling of 19139723 in words is "nineteen million, one hundred thirty-nine thousand, seven hundred twenty-three".