19879992 has 80 divisors (see below), whose sum is σ = 60766200. Its totient is φ = 6022080.

The previous prime is 19879973. The next prime is 19879997. The reversal of 19879992 is 29997891.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19879997) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5734 + ... + 8522.

Almost surely, 2^19879992 is an apocalyptic number.

19879992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19879992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30383100).

19879992 is an abundant number, since it is smaller than the sum of its proper divisors (40886208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19879992 is a wasteful number, since it uses less digits than its factorization.

19879992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2805 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 19879992 is about 4458.6984647989. The cubic root of 19879992 is about 270.8977523976.

It can be divided in two parts, 198799 and 92, that added together give a palindrome (198891).

The spelling of 19879992 in words is "nineteen million, eight hundred seventy-nine thousand, nine hundred ninety-two".