405323240 has 32 divisors (see below), whose sum is σ = 1042260480. Its totient is φ = 138967872.

The previous prime is 405323221. The next prime is 405323249. The reversal of 405323240 is 42323504.

It is not an unprimeable number, because it can be changed into a prime (405323249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723512 + ... + 724071.

It is an arithmetic number, because the mean of its divisors is an integer number (32570640).

Almost surely, 2^405323240 is an apocalyptic number.

405323240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

405323240 is an abundant number, since it is smaller than the sum of its proper divisors (636937240).

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

405323240 is a wasteful number, since it uses less digits than its factorization.

405323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447601 (or 1447597 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 405323240 is about 20132.6411580796. The cubic root of 405323240 is about 740.0604041270.

Adding to 405323240 its reverse (42323504), we get a palindrome (447646744).

The spelling of 405323240 in words is "four hundred five million, three hundred twenty-three thousand, two hundred forty".