423404220 has 96 divisors (see below), whose sum is σ = 1205886528. Its totient is φ = 110989312.

The previous prime is 423404173. The next prime is 423404257. The reversal of 423404220 is 22404324.

It is a super-2 number, since 2×423404220² = 358542267027616800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1335502 + ... + 1335818.

It is an arithmetic number, because the mean of its divisors is an integer number (12561318).

Almost surely, 2^423404220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423404220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602943264).

423404220 is an abundant number, since it is smaller than the sum of its proper divisors (782482308).

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

423404220 is a wasteful number, since it uses less digits than its factorization.

423404220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 637 counting only the distinct ones).

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

The square root of 423404220 is about 20576.7883791422. The cubic root of 423404220 is about 750.9051117021.

Adding to 423404220 its reverse (22404324), we get a palindrome (445808544).

The spelling of 423404220 in words is "four hundred twenty-three million, four hundred four thousand, two hundred twenty".