1861878486924 has 36 divisors (see below), whose sum is σ = 4806551559264. Its totient is φ = 607421349792.

The previous prime is 1861878486907. The next prime is 1861878486953. The reversal of 1861878486924 is 4296848781681.

It is a happy number.

1861878486924 is a `hidden beast` number, since 1 + 8 + 61 + 87 + 8 + 486 + 9 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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, 550198807 + ... + 550202190.

Almost surely, 2^{1861878486924} is an apocalyptic number.

It is an amenable number.

1861878486924 is an abundant number, since it is smaller than the sum of its proper divisors (2944673072340).

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

1861878486924 is a wasteful number, since it uses less digits than its factorization.

1861878486924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100401054 (or 1100401049 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 72.

The spelling of 1861878486924 in words is "one trillion, eight hundred sixty-one billion, eight hundred seventy-eight million, four hundred eighty-six thousand, nine hundred twenty-four".