1986309923 has 16 divisors (see below), whose sum is σ = 2234136576. Its totient is φ = 1752204960.

The previous prime is 1986309917. The next prime is 1986309967. The reversal of 1986309923 is 3299036891.

It is a cyclic number.

It is not a de Polignac number, because 1986309923 - 2¹⁰ = 1986308899 is a prime.

It is a super-2 number, since 2×1986309923² = 7890854220416531858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986309973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430358 + ... + 434948.

It is an arithmetic number, because the mean of its divisors is an integer number (139633536).

Almost surely, 2^1986309923 is an apocalyptic number.

1986309923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1986309923 is a deficient number, since it is larger than the sum of its proper divisors (247826653).

1986309923 is a wasteful number, since it uses less digits than its factorization.

1986309923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 1986309923 is about 44568.0370108444. The cubic root of 1986309923 is about 1257.0397295796.

The spelling of 1986309923 in words is "one billion, nine hundred eighty-six million, three hundred nine thousand, nine hundred twenty-three".