402621 has 4 divisors (see below), whose sum is σ = 536832. Its totient is φ = 268412.

The previous prime is 402613. The next prime is 402631. The reversal of 402621 is 126204.

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 402621 - 2³ = 402613 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 402621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402601) 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, 67101 + ... + 67106.

It is an arithmetic number, because the mean of its divisors is an integer number (134208).

2⁴⁰²⁶²¹ is an apocalyptic number.

It is an amenable number.

402621 is a deficient number, since it is larger than the sum of its proper divisors (134211).

402621 is a wasteful number, since it uses less digits than its factorization.

402621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134210.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 402621 is about 634.5242312158. The cubic root of 402621 is about 73.8412105231.

Adding to 402621 its reverse (126204), we get a palindrome (528825).

The spelling of 402621 in words is "four hundred two thousand, six hundred twenty-one".