388215813 has 4 divisors (see below), whose sum is σ = 517621088. Its totient is φ = 258810540.

The previous prime is 388215797. The next prime is 388215823. The reversal of 388215813 is 318512883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 388215813 - 2⁴ = 388215797 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 (388215823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64702633 + ... + 64702638.

It is an arithmetic number, because the mean of its divisors is an integer number (129405272).

Almost surely, 2^388215813 is an apocalyptic number.

It is an amenable number.

388215813 is a deficient number, since it is larger than the sum of its proper divisors (129405275).

388215813 is a wasteful number, since it uses less digits than its factorization.

388215813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129405274.

The product of its digits is 46080, while the sum is 39.

The square root of 388215813 is about 19703.1929645933. The cubic root of 388215813 is about 729.4985065056.

The spelling of 388215813 in words is "three hundred eighty-eight million, two hundred fifteen thousand, eight hundred thirteen".