420402 has 8 divisors (see below), whose sum is σ = 840816. Its totient is φ = 140132.

The previous prime is 420397. The next prime is 420419. The reversal of 420402 is 204024.

It is a sphenic number, since it is the product of 3 distinct primes.

420402 is an admirable number.

It is an unprimeable number.

420402 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35028 + ... + 35039.

It is an arithmetic number, because the mean of its divisors is an integer number (105102).

2⁴²⁰⁴⁰² is an apocalyptic number.

420402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420402 is a wasteful number, since it uses less digits than its factorization.

420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70072.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 420402 is about 648.3841453953. The cubic root of 420402 is about 74.9126093223.

Adding to 420402 its reverse (204024), we get a palindrome (624426).

The spelling of 420402 in words is "four hundred twenty thousand, four hundred two", and thus it is an iban number.