388767993 has 8 divisors (see below), whose sum is σ = 535078656. Its totient is φ = 250818000.

The previous prime is 388767989. The next prime is 388768013. The reversal of 388767993 is 399767883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 388767993 - 2² = 388767989 is a prime.

It is a super-2 number, since 2×388767993² = 302281104762496098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388767913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2090058 + ... + 2090243.

It is an arithmetic number, because the mean of its divisors is an integer number (66884832).

Almost surely, 2^388767993 is an apocalyptic number.

It is an amenable number.

388767993 is a deficient number, since it is larger than the sum of its proper divisors (146310663).

388767993 is a wasteful number, since it uses less digits than its factorization.

388767993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4180335.

The product of its digits is 13716864, while the sum is 60.

The square root of 388767993 is about 19717.2004351531. The cubic root of 388767993 is about 729.8442108287.

The spelling of 388767993 in words is "three hundred eighty-eight million, seven hundred sixty-seven thousand, nine hundred ninety-three".