1861898956 has 24 divisors (see below), whose sum is σ = 3451968576. Its totient is φ = 875685120.

The previous prime is 1861898947. The next prime is 1861898971. The reversal of 1861898956 is 6598981681.

It is a junction number, because it is equal to n+sod(n) for n = 1861898894 and 1861898903.

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, 128941 + ... + 142651.

It is an arithmetic number, because the mean of its divisors is an integer number (143832024).

Almost surely, 2^1861898956 is an apocalyptic number.

It is an amenable number.

1861898956 is a deficient number, since it is larger than the sum of its proper divisors (1590069620).

1861898956 is a wasteful number, since it uses less digits than its factorization.

1861898956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15729 (or 15727 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 61.

The square root of 1861898956 is about 43149.7271833786. The cubic root of 1861898956 is about 1230.2273261726.

The spelling of 1861898956 in words is "one billion, eight hundred sixty-one million, eight hundred ninety-eight thousand, nine hundred fifty-six".