388813391 has 4 divisors (see below), whose sum is σ = 390482352. Its totient is φ = 387144432.

The previous prime is 388813387. The next prime is 388813423. The reversal of 388813391 is 193318883.

It is a happy number.

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 388813391 - 2² = 388813387 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 (388813301) 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, 834131 + ... + 834596.

It is an arithmetic number, because the mean of its divisors is an integer number (97620588).

Almost surely, 2^388813391 is an apocalyptic number.

388813391 is a deficient number, since it is larger than the sum of its proper divisors (1668961).

388813391 is a wasteful number, since it uses less digits than its factorization.

388813391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668960.

The product of its digits is 124416, while the sum is 44.

The square root of 388813391 is about 19718.3516298904. The cubic root of 388813391 is about 729.8726186696.

The spelling of 388813391 in words is "three hundred eighty-eight million, eight hundred thirteen thousand, three hundred ninety-one".