8406388 has 12 divisors (see below), whose sum is σ = 14913220. Its totient is φ = 4145472.

The previous prime is 8406367. The next prime is 8406439. The reversal of 8406388 is 8836048.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 2196324 = 2492^2 + 1482^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14103 + ... + 14686.

Almost surely, 2^8406388 is an apocalyptic number.

It is an amenable number.

8406388 is a deficient number, since it is larger than the sum of its proper divisors (6506832).

8406388 is a wasteful number, since it uses less digits than its factorization.

8406388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28866 (or 28864 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 8406388 is about 2899.3771744980. The cubic root of 8406388 is about 203.3307879881.

The spelling of 8406388 in words is "eight million, four hundred six thousand, three hundred eighty-eight".