19697913 has 24 divisors (see below), whose sum is σ = 30393792. Its totient is φ = 12263328.

The previous prime is 19697903. The next prime is 19697921. The reversal of 19697913 is 31979691.

It is not a de Polignac number, because 19697913 - 2⁹ = 19697401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19697903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7795 + ... + 10007.

It is an arithmetic number, because the mean of its divisors is an integer number (1266408).

Almost surely, 2^19697913 is an apocalyptic number.

It is an amenable number.

19697913 is a deficient number, since it is larger than the sum of its proper divisors (10695879).

19697913 is a wasteful number, since it uses less digits than its factorization.

19697913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2282 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 19697913 is about 4438.2330943744. The cubic root of 19697913 is about 270.0681720862.

The spelling of 19697913 in words is "nineteen million, six hundred ninety-seven thousand, nine hundred thirteen".