1861039916 has 12 divisors (see below), whose sum is σ = 3268928880. Its totient is φ = 927060240.

The previous prime is 1861039913. The next prime is 1861039931. The reversal of 1861039916 is 6199301681.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1861039913) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 863720 + ... + 865871.

It is an arithmetic number, because the mean of its divisors is an integer number (272410740).

Almost surely, 2^1861039916 is an apocalyptic number.

It is an amenable number.

1861039916 is a deficient number, since it is larger than the sum of its proper divisors (1407888964).

1861039916 is a wasteful number, since it uses less digits than its factorization.

1861039916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729864 (or 1729862 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1861039916 is about 43139.7718584603. The cubic root of 1861039916 is about 1230.0380969538.

The spelling of 1861039916 in words is "one billion, eight hundred sixty-one million, thirty-nine thousand, nine hundred sixteen".