1861145982 has 24 divisors (see below), whose sum is σ = 4035812040. Its totient is φ = 619869840.

The previous prime is 1861145953. The next prime is 1861145999. The reversal of 1861145982 is 2895411681.

It is a happy number.

1861145982 is a `hidden beast` number, since 186 + 11 + 459 + 8 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19944 + ... + 64187.

It is an arithmetic number, because the mean of its divisors is an integer number (168158835).

Almost surely, 2^1861145982 is an apocalyptic number.

1861145982 is an abundant number, since it is smaller than the sum of its proper divisors (2174666058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861145982 is a wasteful number, since it uses less digits than its factorization.

1861145982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85368 (or 85365 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1861145982 is about 43141.0011705802. The cubic root of 1861145982 is about 1230.0614643090.

The spelling of 1861145982 in words is "one billion, eight hundred sixty-one million, one hundred forty-five thousand, nine hundred eighty-two".