405231240 has 128 divisors (see below), whose sum is σ = 1294704000. Its totient is φ = 101173248.

The previous prime is 405231191. The next prime is 405231247. The reversal of 405231240 is 42132504.

It is not an unprimeable number, because it can be changed into a prime (405231247) 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, 201922 + ... + 203918.

It is an arithmetic number, because the mean of its divisors is an integer number (10114875).

Almost surely, 2^405231240 is an apocalyptic number.

405231240 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 405231240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647352000).

405231240 is an abundant number, since it is smaller than the sum of its proper divisors (889472760).

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

405231240 is a wasteful number, since it uses less digits than its factorization.

405231240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 405231240 is about 20130.3561816477. The cubic root of 405231240 is about 740.0044070836.

Adding to 405231240 its reverse (42132504), we get a palindrome (447363744).

The spelling of 405231240 in words is "four hundred five million, two hundred thirty-one thousand, two hundred forty".