1986813963 has 24 divisors (see below), whose sum is σ = 2964648960. Its totient is φ = 1280850480.

The previous prime is 1986813943. The next prime is 1986814019. The reversal of 1986813963 is 3693186891.

1986813963 is a `hidden beast` number, since 198 + 68 + 1 + 396 + 3 = 666.

It is not a de Polignac number, because 1986813963 - 2⁸ = 1986813707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1986813943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 674548 + ... + 677486.

It is an arithmetic number, because the mean of its divisors is an integer number (123527040).

Almost surely, 2^1986813963 is an apocalyptic number.

1986813963 is a deficient number, since it is larger than the sum of its proper divisors (977834997).

1986813963 is a wasteful number, since it uses less digits than its factorization.

1986813963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399 (or 5396 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 1986813963 is about 44573.6913773136. The cubic root of 1986813963 is about 1257.1460481207.

The spelling of 1986813963 in words is "one billion, nine hundred eighty-six million, eight hundred thirteen thousand, nine hundred sixty-three".