402663 has 8 divisors (see below), whose sum is σ = 544000. Its totient is φ = 264888.

The previous prime is 402631. The next prime is 402691. The reversal of 402663 is 366204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402663 - 2⁵ = 402631 is a prime.

It is a Duffinian number.

402663 is a lucky 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 7 ways as a sum of consecutive naturals, for example, 613 + ... + 1086.

It is an arithmetic number, because the mean of its divisors is an integer number (68000).

2⁴⁰²⁶⁶³ is an apocalyptic number.

402663 is a deficient number, since it is larger than the sum of its proper divisors (141337).

402663 is a wasteful number, since it uses less digits than its factorization.

402663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 402663 is about 634.5573260155. The cubic root of 402663 is about 73.8437780519.

Adding to 402663 its reverse (366204), we get a palindrome (768867).

The spelling of 402663 in words is "four hundred two thousand, six hundred sixty-three".