19457837939 has 2 divisors, whose sum is σ = 19457837940. Its totient is φ = 19457837938.

The previous prime is 19457837929. The next prime is 19457837953. The reversal of 19457837939 is 93973875491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19457837939 - 2¹⁶ = 19457772403 is a prime.

It is not a weakly prime, because it can be changed into another prime (19457837929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9728918969 + 9728918970.

It is an arithmetic number, because the mean of its divisors is an integer number (9728918970).

Almost surely, 2^19457837939 is an apocalyptic number.

19457837939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19457837939 is an equidigital number, since it uses as much as digits as its factorization.

19457837939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 65.

The spelling of 19457837939 in words is "nineteen billion, four hundred fifty-seven million, eight hundred thirty-seven thousand, nine hundred thirty-nine".