1861530872 has 64 divisors (see below), whose sum is σ = 3857868000. Its totient is φ = 838389760.

The previous prime is 1861530863. The next prime is 1861530883. The reversal of 1861530872 is 2780351681.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 15 ways as a sum of consecutive naturals, for example, 292379 + ... + 298677.

Almost surely, 2^1861530872 is an apocalyptic number.

It is an amenable number.

1861530872 is an abundant number, since it is smaller than the sum of its proper divisors (1996337128).

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

1861530872 is a wasteful number, since it uses less digits than its factorization.

1861530872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416 (or 6412 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1861530872 is about 43145.4617775729. The cubic root of 1861530872 is about 1230.1462518054.

The spelling of 1861530872 in words is "one billion, eight hundred sixty-one million, five hundred thirty thousand, eight hundred seventy-two".