402401663 has 4 divisors (see below), whose sum is σ = 406923120. Its totient is φ = 397880208.

The previous prime is 402401647. The next prime is 402401683. The reversal of 402401663 is 366104204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402401663 - 2⁴ = 402401647 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402401683) 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, 2260595 + ... + 2260772.

It is an arithmetic number, because the mean of its divisors is an integer number (101730780).

Almost surely, 2^402401663 is an apocalyptic number.

402401663 is a deficient number, since it is larger than the sum of its proper divisors (4521457).

402401663 is an equidigital number, since it uses as much as digits as its factorization.

402401663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521456.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 402401663 is about 20059.9517197824. The cubic root of 402401663 is about 738.2779919126.

Adding to 402401663 its reverse (366104204), we get a palindrome (768505867).

The spelling of 402401663 in words is "four hundred two million, four hundred one thousand, six hundred sixty-three".