1986113279 has 4 divisors (see below), whose sum is σ = 1987634184. Its totient is φ = 1984592376.

The previous prime is 1986113243. The next prime is 1986113299. The reversal of 1986113279 is 9723116891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1986113279 - 2⁸ = 1986113023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986113299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758492 + ... + 761105.

It is an arithmetic number, because the mean of its divisors is an integer number (496908546).

Almost surely, 2^1986113279 is an apocalyptic number.

1986113279 is a deficient number, since it is larger than the sum of its proper divisors (1520905).

1986113279 is a wasteful number, since it uses less digits than its factorization.

1986113279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520904.

The product of its digits is 163296, while the sum is 47.

The square root of 1986113279 is about 44565.8308460641. The cubic root of 1986113279 is about 1256.9982460435.

The spelling of 1986113279 in words is "one billion, nine hundred eighty-six million, one hundred thirteen thousand, two hundred seventy-nine".