1821492 has 36 divisors (see below), whose sum is σ = 4848480. Its totient is φ = 574992.

The previous prime is 1821487. The next prime is 1821497. The reversal of 1821492 is 2941281.

It is an interprime number because it is at equal distance from previous prime (1821487) and next prime (1821497).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 648 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (134680).

2^1821492 is an apocalyptic number.

1821492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821492 is an abundant number, since it is smaller than the sum of its proper divisors (3026988).

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

1821492 is a wasteful number, since it uses less digits than its factorization.

1821492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692 (or 2687 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1821492 is about 1349.6266150310. The cubic root of 1821492 is about 122.1262689809.

The spelling of 1821492 in words is "one million, eight hundred twenty-one thousand, four hundred ninety-two".