1986864499 has 4 divisors (see below), whose sum is σ = 2073249936. Its totient is φ = 1900479064.

The previous prime is 1986864487. The next prime is 1986864521. The reversal of 1986864499 is 9944686891.

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 1986864499 - 2¹³ = 1986856307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1986864499.

It is not an unprimeable number, because it can be changed into a prime (1986864419) 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, 43192684 + ... + 43192729.

It is an arithmetic number, because the mean of its divisors is an integer number (518312484).

Almost surely, 2^1986864499 is an apocalyptic number.

1986864499 is a deficient number, since it is larger than the sum of its proper divisors (86385437).

1986864499 is an equidigital number, since it uses as much as digits as its factorization.

1986864499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86385436.

The product of its digits is 26873856, while the sum is 64.

The square root of 1986864499 is about 44574.2582551858. The cubic root of 1986864499 is about 1257.1567068261.

The spelling of 1986864499 in words is "one billion, nine hundred eighty-six million, eight hundred sixty-four thousand, four hundred ninety-nine".