405521142 has 64 divisors (see below), whose sum is σ = 959454720. Its totient is φ = 113059584.

The previous prime is 405521087. The next prime is 405521153. The reversal of 405521142 is 241125504.

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, 28138 + ... + 40034.

It is an arithmetic number, because the mean of its divisors is an integer number (14991480).

Almost surely, 2^405521142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405521142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479727360).

405521142 is an abundant number, since it is smaller than the sum of its proper divisors (553933578).

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

405521142 is a wasteful number, since it uses less digits than its factorization.

405521142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11957.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 405521142 is about 20137.5555120278. Note that the first 4 decimals coincide. The cubic root of 405521142 is about 740.1808311421.

Adding to 405521142 its reverse (241125504), we get a palindrome (646646646).

The spelling of 405521142 in words is "four hundred five million, five hundred twenty-one thousand, one hundred forty-two".