402739669 has 2 divisors, whose sum is σ = 402739670. Its totient is φ = 402739668.

The previous prime is 402739609. The next prime is 402739681. The reversal of 402739669 is 966937204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229159044 + 173580625 = 15138^2 + 13175^2 .

It is a cyclic number.

It is not a de Polignac number, because 402739669 - 2¹⁵ = 402706901 is a prime.

It is a super-2 number, since 2×402739669² = 324398481972459122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402739609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201369834 + 201369835.

It is an arithmetic number, because the mean of its divisors is an integer number (201369835).

Almost surely, 2^402739669 is an apocalyptic number.

It is an amenable number.

402739669 is a deficient number, since it is larger than the sum of its proper divisors (1).

402739669 is an equidigital number, since it uses as much as digits as its factorization.

402739669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 402739669 is about 20068.3748470074. The cubic root of 402739669 is about 738.4846449303.

The spelling of 402739669 in words is "four hundred two million, seven hundred thirty-nine thousand, six hundred sixty-nine".