1986309956 has 12 divisors (see below), whose sum is σ = 3520043520. Its totient is φ = 980583240.

The previous prime is 1986309917. The next prime is 1986309967. The reversal of 1986309956 is 6599036891.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3142580 + ... + 3143211.

It is an arithmetic number, because the mean of its divisors is an integer number (293336960).

Almost surely, 2^1986309956 is an apocalyptic number.

It is an amenable number.

1986309956 is a deficient number, since it is larger than the sum of its proper divisors (1533733564).

1986309956 is a wasteful number, since it uses less digits than its factorization.

1986309956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6285874 (or 6285872 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 56.

The square root of 1986309956 is about 44568.0373810649. The cubic root of 1986309956 is about 1257.0397365410.

The spelling of 1986309956 in words is "one billion, nine hundred eighty-six million, three hundred nine thousand, nine hundred fifty-six".