19669739 has 2 divisors, whose sum is σ = 19669740. Its totient is φ = 19669738.

The previous prime is 19669733. The next prime is 19669789. The reversal of 19669739 is 93796691.

It is an a-pointer prime, because the next prime (19669789) can be obtained adding 19669739 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19669739 - 2⁸ = 19669483 is a prime.

It is not a weakly prime, because it can be changed into another prime (19669733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9834869 + 9834870.

It is an arithmetic number, because the mean of its divisors is an integer number (9834870).

Almost surely, 2^19669739 is an apocalyptic number.

19669739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19669739 is an equidigital number, since it uses as much as digits as its factorization.

19669739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 50.

The square root of 19669739 is about 4435.0579477612. The cubic root of 19669739 is about 269.9393508037.

The spelling of 19669739 in words is "nineteen million, six hundred sixty-nine thousand, seven hundred thirty-nine".