390221269 has 2 divisors, whose sum is σ = 390221270. Its totient is φ = 390221268.

The previous prime is 390221239. The next prime is 390221309. The reversal of 390221269 is 962122093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371988369 + 18232900 = 19287^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 390221269 - 2²⁷ = 256003541 is a prime.

It is a super-2 number, since 2×390221269² = 304545277559940722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390221219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195110634 + 195110635.

It is an arithmetic number, because the mean of its divisors is an integer number (195110635).

Almost surely, 2^390221269 is an apocalyptic number.

It is an amenable number.

390221269 is a deficient number, since it is larger than the sum of its proper divisors (1).

390221269 is an equidigital number, since it uses as much as digits as its factorization.

390221269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 390221269 is about 19754.0190594218. The cubic root of 390221269 is about 730.7525041965.

The spelling of 390221269 in words is "three hundred ninety million, two hundred twenty-one thousand, two hundred sixty-nine".