19715997 has 8 divisors (see below), whose sum is σ = 30043456. Its totient is φ = 11266272.

The previous prime is 19715987. The next prime is 19715999. The reversal of 19715997 is 79951791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19715997 - 2⁶ = 19715933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19715999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469408 + ... + 469449.

It is an arithmetic number, because the mean of its divisors is an integer number (3755432).

Almost surely, 2^19715997 is an apocalyptic number.

It is an amenable number.

19715997 is a deficient number, since it is larger than the sum of its proper divisors (10327459).

19715997 is an equidigital number, since it uses as much as digits as its factorization.

19715997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938867.

The product of its digits is 178605, while the sum is 48.

The square root of 19715997 is about 4440.2699242276. The cubic root of 19715997 is about 270.1507936817.

The spelling of 19715997 in words is "nineteen million, seven hundred fifteen thousand, nine hundred ninety-seven".