423021240 has 96 divisors (see below), whose sum is σ = 1381582800. Its totient is φ = 112250880.

The previous prime is 423021239. The next prime is 423021241. The reversal of 423021240 is 42120324.

423021240 is a `hidden beast` number, since 423 + 0 + 2 + 1 + 240 = 666.

It is an interprime number because it is at equal distance from previous prime (423021239) and next prime (423021241).

It is a super-2 number, since 2×423021240² = 357893938982275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423021241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73176 + ... + 78744.

Almost surely, 2^423021240 is an apocalyptic number.

423021240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423021240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690791400).

423021240 is an abundant number, since it is smaller than the sum of its proper divisors (958561560).

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

423021240 is a wasteful number, since it uses less digits than its factorization.

423021240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5797 (or 5790 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 423021240 is about 20567.4801567912. The cubic root of 423021240 is about 750.6786390801.

Adding to 423021240 its reverse (42120324), we get a palindrome (465141564).

The spelling of 423021240 in words is "four hundred twenty-three million, twenty-one thousand, two hundred forty".