1821418972 has 24 divisors (see below), whose sum is σ = 3258385200. Its totient is φ = 890612736.

The previous prime is 1821418961. The next prime is 1821418987. The reversal of 1821418972 is 2798141281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25554 + ... + 65542.

It is an arithmetic number, because the mean of its divisors is an integer number (135766050).

Almost surely, 2^1821418972 is an apocalyptic number.

It is an amenable number.

1821418972 is a deficient number, since it is larger than the sum of its proper divisors (1436966228).

1821418972 is a wasteful number, since it uses less digits than its factorization.

1821418972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40245 (or 40243 counting only the distinct ones).

The product of its digits is 64512, while the sum is 43.

The square root of 1821418972 is about 42678.0853834846. The cubic root of 1821418972 is about 1221.2463684704.

The spelling of 1821418972 in words is "one billion, eight hundred twenty-one million, four hundred eighteen thousand, nine hundred seventy-two".