402129 has 24 divisors (see below), whose sum is σ = 716352. Its totient is φ = 211680.

The previous prime is 402107. The next prime is 402131. The reversal of 402129 is 921204.

It is not a de Polignac number, because 402129 - 2¹² = 398033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 574 + ... + 1064.

It is an arithmetic number, because the mean of its divisors is an integer number (29848).

2⁴⁰²¹²⁹ is an apocalyptic number.

It is an amenable number.

402129 is a deficient number, since it is larger than the sum of its proper divisors (314223).

402129 is a wasteful number, since it uses less digits than its factorization.

402129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 402129 is about 634.1364206541. The cubic root of 402129 is about 73.8111204517.

The spelling of 402129 in words is "four hundred two thousand, one hundred twenty-nine".