389999218877 has 4 divisors (see below), whose sum is σ = 392153910876. Its totient is φ = 387844526880.

The previous prime is 389999218783. The next prime is 389999218907. The reversal of 389999218877 is 778812999983.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47533156441 + 342466062436 = 218021^2 + 585206^2 .

It is a cyclic number.

It is not a de Polignac number, because 389999218877 - 2¹⁸ = 389998956733 is a prime.

It is a super-2 number, since 2×389999218877² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389999208877) 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, 1077345728 + ... + 1077346089.

It is an arithmetic number, because the mean of its divisors is an integer number (98038477719).

Almost surely, 2^389999218877 is an apocalyptic number.

It is an amenable number.

389999218877 is a deficient number, since it is larger than the sum of its proper divisors (2154691999).

389999218877 is a wasteful number, since it uses less digits than its factorization.

389999218877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154691998.

The product of its digits is 987614208, while the sum is 80.

The spelling of 389999218877 in words is "three hundred eighty-nine billion, nine hundred ninety-nine million, two hundred eighteen thousand, eight hundred seventy-seven".