1859978494 has 8 divisors (see below), whose sum is σ = 3043601208. Its totient is φ = 845444760.

The previous prime is 1859978447. The next prime is 1859978501. The reversal of 1859978494 is 4948799581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1859978494³ (a number of 29 digits) contains 333 as substring.

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, 42272217 + ... + 42272260.

It is an arithmetic number, because the mean of its divisors is an integer number (380450151).

Almost surely, 2^1859978494 is an apocalyptic number.

1859978494 is a deficient number, since it is larger than the sum of its proper divisors (1183622714).

1859978494 is a wasteful number, since it uses less digits than its factorization.

1859978494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84544490.

The product of its digits is 26127360, while the sum is 64.

The square root of 1859978494 is about 43127.4679757576. The cubic root of 1859978494 is about 1229.8042066123.

It can be divided in two parts, 185997 and 8494, that added together give a palindrome (194491).

The spelling of 1859978494 in words is "one billion, eight hundred fifty-nine million, nine hundred seventy-eight thousand, four hundred ninety-four".