406404688 has 10 divisors (see below), whose sum is σ = 787409114. Its totient is φ = 203202336.

The previous prime is 406404679. The next prime is 406404701. The reversal of 406404688 is 886404604.

It can be written as a sum of positive squares in only one way, i.e., 264127504 + 142277184 = 16252^2 + 11928^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 406404688.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 12700131 + ... + 12700162.

Almost surely, 2^406404688 is an apocalyptic number.

It is an amenable number.

406404688 is a deficient number, since it is larger than the sum of its proper divisors (381004426).

406404688 is a wasteful number, since it uses less digits than its factorization.

406404688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25400301 (or 25400295 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 406404688 is about 20159.4813425346. The cubic root of 406404688 is about 740.7180077562.

The spelling of 406404688 in words is "four hundred six million, four hundred four thousand, six hundred eighty-eight".