402644 has 12 divisors (see below), whose sum is σ = 768768. Its totient is φ = 183000.

The previous prime is 402631. The next prime is 402691. The reversal of 402644 is 446204.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

402644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4532 + ... + 4619.

It is an arithmetic number, because the mean of its divisors is an integer number (64064).

2⁴⁰²⁶⁴⁴ is an apocalyptic number.

402644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

402644 is a deficient number, since it is larger than the sum of its proper divisors (366124).

402644 is a wasteful number, since it uses less digits than its factorization.

402644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9166 (or 9164 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 402644 is about 634.5423547723. The cubic root of 402644 is about 73.8426165729.

Adding to 402644 its reverse (446204), we get a palindrome (848848).

The spelling of 402644 in words is "four hundred two thousand, six hundred forty-four".