402520 has 32 divisors (see below), whose sum is σ = 939600. Its totient is φ = 155008.

The previous prime is 402517. The next prime is 402527. The reversal of 402520 is 25204.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 402520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402527) 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 7 ways as a sum of consecutive naturals, for example, 987 + ... + 1333.

2⁴⁰²⁵²⁰ is an apocalyptic number.

402520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469800).

402520 is an abundant number, since it is smaller than the sum of its proper divisors (537080).

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

402520 is a wasteful number, since it uses less digits than its factorization.

402520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 402520 is about 634.4446390348. Note that the first 3 decimals coincide. The cubic root of 402520 is about 73.8350354967.

Adding to 402520 its reverse (25204), we get a palindrome (427724).

The spelling of 402520 in words is "four hundred two thousand, five hundred twenty".