388434933 has 20 divisors (see below), whose sum is σ = 591209388. Its totient is φ = 254067840.

The previous prime is 388434911. The next prime is 388434941. The reversal of 388434933 is 339434883.

It can be written as a sum of positive squares in 2 ways, for example, as 142635249 + 245799684 = 11943^2 + 15678^2 .

It is not a de Polignac number, because 388434933 - 2⁹ = 388434421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388434983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40948 + ... + 49533.

Almost surely, 2^388434933 is an apocalyptic number.

It is an amenable number.

388434933 is a deficient number, since it is larger than the sum of its proper divisors (202774455).

388434933 is an equidigital number, since it uses as much as digits as its factorization.

388434933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90546 (or 90537 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 388434933 is about 19708.7527002599. The cubic root of 388434933 is about 729.6357305638.

Subtracting from 388434933 its reverse (339434883), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 388434933 in words is "three hundred eighty-eight million, four hundred thirty-four thousand, nine hundred thirty-three".