402321217 has 2 divisors, whose sum is σ = 402321218. Its totient is φ = 402321216.

The previous prime is 402321211. The next prime is 402321223. The reversal of 402321217 is 712123204.

It is a balanced prime because it is at equal distance from previous prime (402321211) and next prime (402321223).

It can be written as a sum of positive squares in only one way, i.e., 216707841 + 185613376 = 14721^2 + 13624^2 .

It is a cyclic number.

It is not a de Polignac number, because 402321217 - 2³ = 402321209 is a prime.

It is a super-2 number, since 2×402321217² = 323724723296722178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402321211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201160608 + 201160609.

It is an arithmetic number, because the mean of its divisors is an integer number (201160609).

Almost surely, 2^402321217 is an apocalyptic number.

It is an amenable number.

402321217 is a deficient number, since it is larger than the sum of its proper divisors (1).

402321217 is an equidigital number, since it uses as much as digits as its factorization.

402321217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 402321217 is about 20057.9464801360. The cubic root of 402321217 is about 738.2287910974.

The spelling of 402321217 in words is "four hundred two million, three hundred twenty-one thousand, two hundred seventeen".