402642 has 12 divisors (see below), whose sum is σ = 872430. Its totient is φ = 134208.

The previous prime is 402631. The next prime is 402691. The reversal of 402642 is 246204.

It can be written as a sum of positive squares in only one way, i.e., 349281 + 53361 = 591^2 + 231^2 .

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: 22369 = 402642 / (4 + 0 + 2 + 6 + 4 + 2).

It is a plaindrome in base 11 and base 13.

It is an unprimeable number.

402642 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 5 ways as a sum of consecutive naturals, for example, 11167 + ... + 11202.

2⁴⁰²⁶⁴² is an apocalyptic number.

402642 is an abundant number, since it is smaller than the sum of its proper divisors (469788).

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

402642 is a wasteful number, since it uses less digits than its factorization.

402642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22377 (or 22374 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 402642 is about 634.5407788314. The cubic root of 402642 is about 73.8424943098.

Adding to 402642 its reverse (246204), we get a palindrome (648846).

The spelling of 402642 in words is "four hundred two thousand, six hundred forty-two".