19974697 has 4 divisors (see below), whose sum is σ = 20215440. Its totient is φ = 19733956.

The previous prime is 19974683. The next prime is 19974727. The reversal of 19974697 is 79647991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79647991 = 4721 ⋅16871.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19974697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19974637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120247 + ... + 120412.

It is an arithmetic number, because the mean of its divisors is an integer number (5053860).

Almost surely, 2^19974697 is an apocalyptic number.

It is an amenable number.

19974697 is a deficient number, since it is larger than the sum of its proper divisors (240743).

19974697 is an equidigital number, since it uses as much as digits as its factorization.

19974697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240742.

The product of its digits is 857304, while the sum is 52.

The square root of 19974697 is about 4469.3060982663. The cubic root of 19974697 is about 271.3272418361.

The spelling of 19974697 in words is "nineteen million, nine hundred seventy-four thousand, six hundred ninety-seven".