19979894 has 16 divisors (see below), whose sum is σ = 32956416. Its totient is φ = 9009000.

The previous prime is 19979891. The next prime is 19979899. The reversal of 19979894 is 49897991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979891) 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, 782 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (2059776).

Almost surely, 2^19979894 is an apocalyptic number.

19979894 is a deficient number, since it is larger than the sum of its proper divisors (12976522).

19979894 is a wasteful number, since it uses less digits than its factorization.

19979894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7291.

The product of its digits is 1469664, while the sum is 56.

The square root of 19979894 is about 4469.8874706194. The cubic root of 19979894 is about 271.3507710274.

The spelling of 19979894 in words is "nineteen million, nine hundred seventy-nine thousand, eight hundred ninety-four".