1861120580 has 48 divisors (see below), whose sum is σ = 4266876096. Its totient is φ = 676260480.

The previous prime is 1861120579. The next prime is 1861120607. The reversal of 1861120580 is 850211681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410687 + ... + 415193.

It is an arithmetic number, because the mean of its divisors is an integer number (88893252).

Almost surely, 2^1861120580 is an apocalyptic number.

1861120580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861120580 is an abundant number, since it is smaller than the sum of its proper divisors (2405755516).

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

1861120580 is a wasteful number, since it uses less digits than its factorization.

1861120580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6404 (or 6402 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 1861120580 is about 43140.7067628707. The cubic root of 1861120580 is about 1230.0558680861.

The spelling of 1861120580 in words is "one billion, eight hundred sixty-one million, one hundred twenty thousand, five hundred eighty".