6390388 has 6 divisors (see below), whose sum is σ = 11183186. Its totient is φ = 3195192.

The previous prime is 6390379. The next prime is 6390401. The reversal of 6390388 is 8830936.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4235364 + 2155024 = 2058^2 + 1468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798795 + ... + 798802.

Almost surely, 2^6390388 is an apocalyptic number.

It is an amenable number.

6390388 is a deficient number, since it is larger than the sum of its proper divisors (4792798).

6390388 is a wasteful number, since it uses less digits than its factorization.

6390388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597601 (or 1597599 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 6390388 is about 2527.9216760018. The cubic root of 6390388 is about 185.5705589573.

The spelling of 6390388 in words is "six million, three hundred ninety thousand, three hundred eighty-eight".