19821492 has 72 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 6139584.

The previous prime is 19821449. The next prime is 19821497. The reversal of 19821492 is 29412891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19821497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30313 + ... + 30959.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^19821492 is an apocalyptic number.

19821492 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 19821492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26889408).

19821492 is an abundant number, since it is smaller than the sum of its proper divisors (33957324).

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

19821492 is a wasteful number, since it uses less digits than its factorization.

19821492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 712 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 19821492 is about 4452.1334211814. The cubic root of 19821492 is about 270.6317715967.

The spelling of 19821492 in words is "nineteen million, eight hundred twenty-one thousand, four hundred ninety-two".