398877694639 has 4 divisors (see below), whose sum is σ = 402407585856. Its totient is φ = 395347803424.

The previous prime is 398877694637. The next prime is 398877694643. The reversal of 398877694639 is 936496778893.

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 398877694639 - 2¹ = 398877694637 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 (398877694637) 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, 1764945439 + ... + 1764945664.

It is an arithmetic number, because the mean of its divisors is an integer number (100601896464).

Almost surely, 2^398877694639 is an apocalyptic number.

398877694639 is a deficient number, since it is larger than the sum of its proper divisors (3529891217).

398877694639 is a wasteful number, since it uses less digits than its factorization.

398877694639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529891216.

The product of its digits is 2962842624, while the sum is 79.

The spelling of 398877694639 in words is "three hundred ninety-eight billion, eight hundred seventy-seven million, six hundred ninety-four thousand, six hundred thirty-nine".