1821922436 has 24 divisors (see below), whose sum is σ = 3409352856. Its totient is φ = 848883200.

The previous prime is 1821922379. The next prime is 1821922457. The reversal of 1821922436 is 6342291281.

It can be written as a sum of positive squares in 4 ways, for example, as 422713600 + 1399208836 = 20560^2 + 37406^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1821922436.

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, 125771 + ... + 139506.

It is an arithmetic number, because the mean of its divisors is an integer number (142056369).

Almost surely, 2^1821922436 is an apocalyptic number.

It is an amenable number.

1821922436 is a deficient number, since it is larger than the sum of its proper divisors (1587430420).

1821922436 is a wasteful number, since it uses less digits than its factorization.

1821922436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265399 (or 265397 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 1821922436 is about 42683.9833661293. The cubic root of 1821922436 is about 1221.3588809215.

The spelling of 1821922436 in words is "one billion, eight hundred twenty-one million, nine hundred twenty-two thousand, four hundred thirty-six".