388731290 has 8 divisors (see below), whose sum is σ = 699716340. Its totient is φ = 155492512.

The previous prime is 388731269. The next prime is 388731293. The reversal of 388731290 is 92137883.

It can be written as a sum of positive squares in 2 ways, for example, as 370524001 + 18207289 = 19249^2 + 4267^2 .

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

It is a super-2 number, since 2×388731290² = 302224031650128200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388731293) 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, 19436555 + ... + 19436574.

Almost surely, 2^388731290 is an apocalyptic number.

388731290 is a deficient number, since it is larger than the sum of its proper divisors (310985050).

388731290 is a wasteful number, since it uses less digits than its factorization.

388731290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38873136.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 388731290 is about 19716.2696776038. The cubic root of 388731290 is about 729.8212422754.

The spelling of 388731290 in words is "three hundred eighty-eight million, seven hundred thirty-one thousand, two hundred ninety".