402653 has 4 divisors (see below), whose sum is σ = 404448. Its totient is φ = 400860.

The previous prime is 402631. The next prime is 402691. The reversal of 402653 is 356204.

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 402653 - 2¹⁰ = 401629 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402613) 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, 503 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (101112).

2⁴⁰²⁶⁵³ is an apocalyptic number.

It is an amenable number.

402653 is a deficient number, since it is larger than the sum of its proper divisors (1795).

402653 is a wasteful number, since it uses less digits than its factorization.

402653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 402653 is about 634.5494464579. The cubic root of 402653 is about 73.8431667517.

Adding to 402653 its reverse (356204), we get a palindrome (758857).

The spelling of 402653 in words is "four hundred two thousand, six hundred fifty-three".