19979892 has 24 divisors (see below), whose sum is σ = 51800000. Its totient is φ = 6659928.

The previous prime is 19979891. The next prime is 19979899. The reversal of 19979892 is 29897991.

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 (19979891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92392 + ... + 92607.

Almost surely, 2^19979892 is an apocalyptic number.

19979892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19979892 is an abundant number, since it is smaller than the sum of its proper divisors (31820108).

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

19979892 is a wasteful number, since it uses less digits than its factorization.

19979892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185012 (or 185004 counting only the distinct ones).

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

The square root of 19979892 is about 4469.8872469001. The cubic root of 19979892 is about 271.3507619733.

It can be divided in two parts, 1997989 and 2, that added together give a palindrome (1997991).

The spelling of 19979892 in words is "nineteen million, nine hundred seventy-nine thousand, eight hundred ninety-two".