19697965 has 24 divisors (see below), whose sum is σ = 28529280. Its totient is φ = 12788064.

The previous prime is 19697957. The next prime is 19697969. The reversal of 19697965 is 56979691.

It is not a de Polignac number, because 19697965 - 2³ = 19697957 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19697969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11856 + ... + 13414.

It is an arithmetic number, because the mean of its divisors is an integer number (1188720).

Almost surely, 2^19697965 is an apocalyptic number.

It is an amenable number.

19697965 is a deficient number, since it is larger than the sum of its proper divisors (8831315).

19697965 is a wasteful number, since it uses less digits than its factorization.

19697965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1590 counting only the distinct ones).

The product of its digits is 918540, while the sum is 52.

The square root of 19697965 is about 4438.2389525576. The cubic root of 19697965 is about 270.0684097346.

The spelling of 19697965 in words is "nineteen million, six hundred ninety-seven thousand, nine hundred sixty-five".