402425321 has 4 divisors (see below), whose sum is σ = 404894352. Its totient is φ = 399956292.

The previous prime is 402425311. The next prime is 402425329. The reversal of 402425321 is 123524204.

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 a de Polignac number, because none of the positive numbers 2^k-402425321 is a prime.

It is a super-2 number, since 2×402425321² = 323892277963906082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402425329) 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, 1234271 + ... + 1234596.

It is an arithmetic number, because the mean of its divisors is an integer number (101223588).

Almost surely, 2^402425321 is an apocalyptic number.

It is an amenable number.

402425321 is a deficient number, since it is larger than the sum of its proper divisors (2469031).

402425321 is a wasteful number, since it uses less digits than its factorization.

402425321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469030.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 402425321 is about 20060.5413934919. The cubic root of 402425321 is about 738.2924599098.

Adding to 402425321 its reverse (123524204), we get a palindrome (525949525).

The spelling of 402425321 in words is "four hundred two million, four hundred twenty-five thousand, three hundred twenty-one".