405698 has 8 divisors (see below), whose sum is σ = 614460. Its totient is φ = 200880.

The previous prime is 405689. The next prime is 405701. The reversal of 405698 is 896504.

It can be written as a sum of positive squares in 2 ways, for example, as 375769 + 29929 = 613^2 + 173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405698.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713 + ... + 1148.

2⁴⁰⁵⁶⁹⁸ is an apocalyptic number.

405698 is a deficient number, since it is larger than the sum of its proper divisors (208762).

405698 is a wasteful number, since it uses less digits than its factorization.

405698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 405698 is about 636.9442675776. The cubic root of 405698 is about 74.0288419347.

The spelling of 405698 in words is "four hundred five thousand, six hundred ninety-eight".