402709 has 4 divisors (see below), whose sum is σ = 404416. Its totient is φ = 401004.

The previous prime is 402697. The next prime is 402739. The reversal of 402709 is 907204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402709 - 2⁷ = 402581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429 + ... + 994.

It is an arithmetic number, because the mean of its divisors is an integer number (101104).

2⁴⁰²⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

402709 is a deficient number, since it is larger than the sum of its proper divisors (1707).

402709 is a wasteful number, since it uses less digits than its factorization.

402709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 402709 is about 634.5935707207. The cubic root of 402709 is about 73.8465899024.

It can be divided in two parts, 402 and 709, that added together give a palindrome (1111).

The spelling of 402709 in words is "four hundred two thousand, seven hundred nine".