1861836012 has 36 divisors (see below), whose sum is σ = 4707624376. Its totient is φ = 620438400.

The previous prime is 1861836007. The next prime is 1861836013. The reversal of 1861836012 is 2106381681.

1861836012 is a `hidden beast` number, since 1 + 8 + 618 + 36 + 0 + 1 + 2 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1861836013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228228 + ... + 236244.

Almost surely, 2^1861836012 is an apocalyptic number.

1861836012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861836012 is an abundant number, since it is smaller than the sum of its proper divisors (2845788364).

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

1861836012 is a wasteful number, since it uses less digits than its factorization.

1861836012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14478 (or 14473 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1861836012 is about 43148.9978099144. The cubic root of 1861836012 is about 1230.2134628529.

The spelling of 1861836012 in words is "one billion, eight hundred sixty-one million, eight hundred thirty-six thousand, twelve".