402606 has 12 divisors (see below), whose sum is σ = 872352. Its totient is φ = 134196.

The previous prime is 402601. The next prime is 402613. The reversal of 402606 is 606204.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 22367 = 402606 / (4 + 0 + 2 + 6 + 0 + 6).

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 11166 + ... + 11201.

It is an arithmetic number, because the mean of its divisors is an integer number (72696).

2⁴⁰²⁶⁰⁶ is an apocalyptic number.

402606 is an abundant number, since it is smaller than the sum of its proper divisors (469746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402606 is a wasteful number, since it uses less digits than its factorization.

402606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22375 (or 22372 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 402606 is about 634.5124112261. The cubic root of 402606 is about 73.8402935053.

The spelling of 402606 in words is "four hundred two thousand, six hundred six".