388313890 has 16 divisors (see below), whose sum is σ = 717856632. Its totient is φ = 151127424.

The previous prime is 388313879. The next prime is 388313921. The reversal of 388313890 is 98313883.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 386161801 + 2152089 = 19651^2 + 1467^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 524379 + ... + 525118.

Almost surely, 2^388313890 is an apocalyptic number.

388313890 is a deficient number, since it is larger than the sum of its proper divisors (329542742).

388313890 is a wasteful number, since it uses less digits than its factorization.

388313890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049541.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 388313890 is about 19705.6816679860. The cubic root of 388313890 is about 729.5599336795.

The spelling of 388313890 in words is "three hundred eighty-eight million, three hundred thirteen thousand, eight hundred ninety".