19692989 has 2 divisors, whose sum is σ = 19692990. Its totient is φ = 19692988.

The previous prime is 19692979. The next prime is 19693007. The reversal of 19692989 is 98929691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12020089 + 7672900 = 3467^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 19692989 - 2⁴ = 19692973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19692989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19692979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9846494 + 9846495.

It is an arithmetic number, because the mean of its divisors is an integer number (9846495).

Almost surely, 2^19692989 is an apocalyptic number.

It is an amenable number.

19692989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19692989 is an equidigital number, since it uses as much as digits as its factorization.

19692989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 53.

The square root of 19692989 is about 4437.6783344447. The cubic root of 19692989 is about 270.0456667156.

The spelling of 19692989 in words is "nineteen million, six hundred ninety-two thousand, nine hundred eighty-nine".