1856983493 has 4 divisors (see below), whose sum is σ = 1857144108. Its totient is φ = 1856822880.

The previous prime is 1856983481. The next prime is 1856983501. The reversal of 1856983493 is 3943896581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3943896581 = 101 ⋅39048481.

It can be written as a sum of positive squares in 2 ways, for example, as 835094404 + 1021889089 = 28898^2 + 31967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856983493 - 2⁸ = 1856983237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856983433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61496 + ... + 86577.

It is an arithmetic number, because the mean of its divisors is an integer number (464286027).

Almost surely, 2^1856983493 is an apocalyptic number.

It is an amenable number.

1856983493 is a deficient number, since it is larger than the sum of its proper divisors (160615).

1856983493 is a wasteful number, since it uses less digits than its factorization.

1856983493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160614.

The product of its digits is 5598720, while the sum is 56.

The square root of 1856983493 is about 43092.7313244357. The cubic root of 1856983493 is about 1229.1437610598.

The spelling of 1856983493 in words is "one billion, eight hundred fifty-six million, nine hundred eighty-three thousand, four hundred ninety-three".