420402252 has 12 divisors (see below), whose sum is σ = 980938616. Its totient is φ = 140134080.

The previous prime is 420402247. The next prime is 420402319. The reversal of 420402252 is 252204024.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17516749 + ... + 17516772.

Almost surely, 2^420402252 is an apocalyptic number.

It is an amenable number.

420402252 is an abundant number, since it is smaller than the sum of its proper divisors (560536364).

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

420402252 is a wasteful number, since it uses less digits than its factorization.

420402252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35033528 (or 35033526 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 420402252 is about 20503.7131271387. The cubic root of 420402252 is about 749.1262429045.

Adding to 420402252 its reverse (252204024), we get a palindrome (672606276).

The spelling of 420402252 in words is "four hundred twenty million, four hundred two thousand, two hundred fifty-two".