19782897 has 8 divisors (see below), whose sum is σ = 26567520. Its totient is φ = 13093440.

The previous prime is 19782887. The next prime is 19782899. The reversal of 19782897 is 79828791.

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

It is not a de Polignac number, because 19782897 - 2²² = 15588593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19782899) 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, 23304 + ... + 24137.

It is an arithmetic number, because the mean of its divisors is an integer number (3320940).

Almost surely, 2^19782897 is an apocalyptic number.

It is an amenable number.

19782897 is a deficient number, since it is larger than the sum of its proper divisors (6784623).

19782897 is a wasteful number, since it uses less digits than its factorization.

19782897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47583.

The product of its digits is 508032, while the sum is 51.

The square root of 19782897 is about 4447.7968703618. The cubic root of 19782897 is about 270.4560058195.

The spelling of 19782897 in words is "nineteen million, seven hundred eighty-two thousand, eight hundred ninety-seven".