402544 has 20 divisors (see below), whose sum is σ = 789880. Its totient is φ = 198720.

The previous prime is 402541. The next prime is 402551. The reversal of 402544 is 445204.

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 (402541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (39494).

2⁴⁰²⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

402544 is a deficient number, since it is larger than the sum of its proper divisors (387336).

402544 is a wasteful number, since it uses less digits than its factorization.

402544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 402544 is about 634.4635529327. The cubic root of 402544 is about 73.8365029233.

Adding to 402544 its reverse (445204), we get a palindrome (847748).

It can be divided in two parts, 402 and 544, that added together give a triangular number (946 = T₄₃).

The spelling of 402544 in words is "four hundred two thousand, five hundred forty-four".