402553 has 4 divisors (see below), whose sum is σ = 423760. Its totient is φ = 381348.

The previous prime is 402551. The next prime is 402559. The reversal of 402553 is 355204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402553 - 2¹ = 402551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 21187 = 402553 / (4 + 0 + 2 + 5 + 5 + 3).

It is a Duffinian number.

402553 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 402553.

It is not an unprimeable number, because it can be changed into a prime (402551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10575 + ... + 10612.

It is an arithmetic number, because the mean of its divisors is an integer number (105940).

2⁴⁰²⁵⁵³ is an apocalyptic number.

It is an amenable number.

402553 is a deficient number, since it is larger than the sum of its proper divisors (21207).

402553 is a wasteful number, since it uses less digits than its factorization.

402553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21206.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 402553 is about 634.4706454991. The cubic root of 402553 is about 73.8370531932.

Adding to 402553 its reverse (355204), we get a palindrome (757757).

The spelling of 402553 in words is "four hundred two thousand, five hundred fifty-three".