402863221 has 4 divisors (see below), whose sum is σ = 402911500. Its totient is φ = 402814944.

The previous prime is 402863207. The next prime is 402863233. The reversal of 402863221 is 122368204.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 209931121 + 192932100 = 14489^2 + 13890^2 .

It is a cyclic number.

It is not a de Polignac number, because 402863221 - 2⁵ = 402863189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402863221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402863261) 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, 8046 + ... + 29503.

It is an arithmetic number, because the mean of its divisors is an integer number (100727875).

Almost surely, 2^402863221 is an apocalyptic number.

402863221 is the 10729-th nonagonal number.

It is an amenable number.

402863221 is a deficient number, since it is larger than the sum of its proper divisors (48279).

402863221 is a wasteful number, since it uses less digits than its factorization.

402863221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48278.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 402863221 is about 20071.4528871230. The cubic root of 402863221 is about 738.5601543583.

The spelling of 402863221 in words is "four hundred two million, eight hundred sixty-three thousand, two hundred twenty-one".