420402234 has 64 divisors (see below), whose sum is σ = 1005778944. Its totient is φ = 114540096.

The previous prime is 420402223. The next prime is 420402239. The reversal of 420402234 is 432204024.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420402234.

It is not an unprimeable number, because it can be changed into a prime (420402239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543472 + ... + 544244.

It is an arithmetic number, because the mean of its divisors is an integer number (15715296).

Almost surely, 2^420402234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420402234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502889472).

420402234 is an abundant number, since it is smaller than the sum of its proper divisors (585376710).

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

420402234 is a wasteful number, since it uses less digits than its factorization.

420402234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 420402234 is about 20503.7126881938. The cubic root of 420402234 is about 749.1262322129.

Adding to 420402234 its reverse (432204024), we get a palindrome (852606258).

The spelling of 420402234 in words is "four hundred twenty million, four hundred two thousand, two hundred thirty-four".