1856491772 has 12 divisors (see below), whose sum is σ = 3262455840. Its totient is φ = 924361536.

The previous prime is 1856491757. The next prime is 1856491787. The reversal of 1856491772 is 2771946581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1856491757) and next prime (1856491787).

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1856491772.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970013 + ... + 971924.

It is an arithmetic number, because the mean of its divisors is an integer number (271871320).

Almost surely, 2^1856491772 is an apocalyptic number.

It is an amenable number.

1856491772 is a deficient number, since it is larger than the sum of its proper divisors (1405964068).

1856491772 is a wasteful number, since it uses less digits than its factorization.

1856491772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942180 (or 1942178 counting only the distinct ones).

The product of its digits is 846720, while the sum is 50.

The square root of 1856491772 is about 43087.0255645479. The cubic root of 1856491772 is about 1229.0352608754.

The spelling of 1856491772 in words is "one billion, eight hundred fifty-six million, four hundred ninety-one thousand, seven hundred seventy-two".