388621392893 has 4 divisors (see below), whose sum is σ = 399124673820. Its totient is φ = 378118111968.

The previous prime is 388621392851. The next prime is 388621392983. The reversal of 388621392893 is 398293126883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 398293126883 = 3253 ⋅122438711.

It can be written as a sum of positive squares in 2 ways, for example, as 290954517604 + 97666875289 = 539402^2 + 312517^2 .

It is a cyclic number.

It is not a de Polignac number, because 388621392893 - 2¹⁰ = 388621391869 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 (388621392293) 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, 5251640408 + ... + 5251640481.

It is an arithmetic number, because the mean of its divisors is an integer number (99781168455).

Almost surely, 2^388621392893 is an apocalyptic number.

It is an amenable number.

388621392893 is a deficient number, since it is larger than the sum of its proper divisors (10503280927).

388621392893 is a wasteful number, since it uses less digits than its factorization.

388621392893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10503280926.

The product of its digits is 26873856, while the sum is 62.

The spelling of 388621392893 in words is "three hundred eighty-eight billion, six hundred twenty-one million, three hundred ninety-two thousand, eight hundred ninety-three".