402686221 has 16 divisors (see below), whose sum is σ = 466202880. Its totient is φ = 340692480.

The previous prime is 402686183. The next prime is 402686233. The reversal of 402686221 is 122686204.

It is a cyclic number.

It is not a de Polignac number, because 402686221 - 2¹¹ = 402684173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402686521) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 236445 + ... + 238141.

It is an arithmetic number, because the mean of its divisors is an integer number (29137680).

Almost surely, 2^402686221 is an apocalyptic number.

It is an amenable number.

402686221 is a deficient number, since it is larger than the sum of its proper divisors (63516659).

402686221 is a wasteful number, since it uses less digits than its factorization.

402686221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 402686221 is about 20067.0431553829. The cubic root of 402686221 is about 738.4519751302.

The spelling of 402686221 in words is "four hundred two million, six hundred eighty-six thousand, two hundred twenty-one".