1861907812 has 24 divisors (see below), whose sum is σ = 3437532000. Its totient is φ = 879975936.

The previous prime is 1861907809. The next prime is 1861907903. The reversal of 1861907812 is 2187091681.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 6843 + ... + 61405.

It is an arithmetic number, because the mean of its divisors is an integer number (143230500).

Almost surely, 2^1861907812 is an apocalyptic number.

It is an amenable number.

1861907812 is a deficient number, since it is larger than the sum of its proper divisors (1575624188).

1861907812 is a wasteful number, since it uses less digits than its factorization.

1861907812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55035 (or 55033 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1861907812 is about 43149.8298026771. The cubic root of 1861907812 is about 1230.2292766679.

The spelling of 1861907812 in words is "one billion, eight hundred sixty-one million, nine hundred seven thousand, eight hundred twelve".