1821490692 has 24 divisors (see below), whose sum is σ = 4857308736. Its totient is φ = 520425888.

The previous prime is 1821490691. The next prime is 1821490709. The reversal of 1821490692 is 2960941281.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1821490691) 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, 10842123 + ... + 10842290.

It is an arithmetic number, because the mean of its divisors is an integer number (202387864).

Almost surely, 2^1821490692 is an apocalyptic number.

1821490692 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821490692 is an abundant number, since it is smaller than the sum of its proper divisors (3035818044).

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

1821490692 is a wasteful number, since it uses less digits than its factorization.

1821490692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21684427 (or 21684425 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 1821490692 is about 42678.9256190921. The cubic root of 1821490692 is about 1221.2623974825.

The spelling of 1821490692 in words is "one billion, eight hundred twenty-one million, four hundred ninety thousand, six hundred ninety-two".