388290247 has 4 divisors (see below), whose sum is σ = 398784616. Its totient is φ = 377795880.

The previous prime is 388290241. The next prime is 388290257. The reversal of 388290247 is 742092883.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742092883 = 7 ⋅106013269.

It is a cyclic number.

It is not a de Polignac number, because 388290247 - 2²⁷ = 254072519 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 (388290241) 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, 5247129 + ... + 5247202.

It is an arithmetic number, because the mean of its divisors is an integer number (99696154).

Almost surely, 2^388290247 is an apocalyptic number.

388290247 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

388290247 is a deficient number, since it is larger than the sum of its proper divisors (10494369).

388290247 is a wasteful number, since it uses less digits than its factorization.

388290247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10494368.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 388290247 is about 19705.0817557299. The cubic root of 388290247 is about 729.5451266415.

The spelling of 388290247 in words is "three hundred eighty-eight million, two hundred ninety thousand, two hundred forty-seven".