19769839 has 2 divisors, whose sum is σ = 19769840. Its totient is φ = 19769838.

The previous prime is 19769821. The next prime is 19769843. The reversal of 19769839 is 93896791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19769839 - 2⁵ = 19769807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19769819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9884919 + 9884920.

It is an arithmetic number, because the mean of its divisors is an integer number (9884920).

Almost surely, 2^19769839 is an apocalyptic number.

19769839 is a deficient number, since it is larger than the sum of its proper divisors (1).

19769839 is an equidigital number, since it uses as much as digits as its factorization.

19769839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 19769839 is about 4446.3287102957. The cubic root of 19769839 is about 270.3964865313.

The spelling of 19769839 in words is "nineteen million, seven hundred sixty-nine thousand, eight hundred thirty-nine".