388435139 has 4 divisors (see below), whose sum is σ = 398933424. Its totient is φ = 377936856.

The previous prime is 388435133. The next prime is 388435147. The reversal of 388435139 is 931534883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931534883 = 41 ⋅22720363.

It is a cyclic number.

It is not a de Polignac number, because 388435139 - 2⁴ = 388435123 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 388435139.

It is not an unprimeable number, because it can be changed into a prime (388435133) 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, 5249087 + ... + 5249160.

It is an arithmetic number, because the mean of its divisors is an integer number (99733356).

Almost surely, 2^388435139 is an apocalyptic number.

388435139 is a deficient number, since it is larger than the sum of its proper divisors (10498285).

388435139 is a wasteful number, since it uses less digits than its factorization.

388435139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10498284.

The product of its digits is 311040, while the sum is 44.

The square root of 388435139 is about 19708.7579263636. The cubic root of 388435139 is about 729.6358595472.

The spelling of 388435139 in words is "three hundred eighty-eight million, four hundred thirty-five thousand, one hundred thirty-nine".