402434521 has 4 divisors (see below), whose sum is σ = 402485200. Its totient is φ = 402383844.

The previous prime is 402434477. The next prime is 402434551. The reversal of 402434521 is 125434204.

It is a happy number.

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 402434521 - 2¹⁷ = 402303449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402434551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10551 + ... + 30268.

It is an arithmetic number, because the mean of its divisors is an integer number (100621300).

Almost surely, 2^402434521 is an apocalyptic number.

It is an amenable number.

402434521 is a deficient number, since it is larger than the sum of its proper divisors (50679).

402434521 is an equidigital number, since it uses as much as digits as its factorization.

402434521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50678.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 402434521 is about 20060.7706980564. The cubic root of 402434521 is about 738.2980859962.

Adding to 402434521 its reverse (125434204), we get a palindrome (527868725).

The spelling of 402434521 in words is "four hundred two million, four hundred thirty-four thousand, five hundred twenty-one".