405740244 has 96 divisors (see below), whose sum is σ = 1169038080. Its totient is φ = 106656768.

The previous prime is 405740243. The next prime is 405740267. The reversal of 405740244 is 442047504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405740243) 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, 621022 + ... + 621674.

It is an arithmetic number, because the mean of its divisors is an integer number (12177480).

Almost surely, 2^405740244 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 405740244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584519040).

405740244 is an abundant number, since it is smaller than the sum of its proper divisors (763297836).

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

405740244 is a wasteful number, since it uses less digits than its factorization.

405740244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 30.

The square root of 405740244 is about 20142.9949113830. The cubic root of 405740244 is about 740.3141130559.

Adding to 405740244 its reverse (442047504), we get a palindrome (847787748).

The spelling of 405740244 in words is "four hundred five million, seven hundred forty thousand, two hundred forty-four".