402689429 has 2 divisors, whose sum is σ = 402689430. Its totient is φ = 402689428.

The previous prime is 402689393. The next prime is 402689431. The reversal of 402689429 is 924986204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400920529 + 1768900 = 20023^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 402689429 - 2²⁰ = 401640853 is a prime.

Together with 402689431, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402689429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402689449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201344714 + 201344715.

It is an arithmetic number, because the mean of its divisors is an integer number (201344715).

Almost surely, 2^402689429 is an apocalyptic number.

It is an amenable number.

402689429 is a deficient number, since it is larger than the sum of its proper divisors (1).

402689429 is an equidigital number, since it uses as much as digits as its factorization.

402689429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 402689429 is about 20067.1230872789. The cubic root of 402689429 is about 738.4539360843.

The spelling of 402689429 in words is "four hundred two million, six hundred eighty-nine thousand, four hundred twenty-nine".