402609 has 8 divisors (see below), whose sum is σ = 549472. Its totient is φ = 262080.

The previous prime is 402601. The next prime is 402613. The reversal of 402609 is 906204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402609 - 2³ = 402601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432 + ... + 1689.

It is an arithmetic number, because the mean of its divisors is an integer number (68684).

2⁴⁰²⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

402609 is a deficient number, since it is larger than the sum of its proper divisors (146863).

402609 is a wasteful number, since it uses less digits than its factorization.

402609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 402609 is about 634.5147752417. The cubic root of 402609 is about 73.8404769107.

The spelling of 402609 in words is "four hundred two thousand, six hundred nine".