405240340 has 12 divisors (see below), whose sum is σ = 851004756. Its totient is φ = 162096128.

The previous prime is 405240323. The next prime is 405240349. The reversal of 405240340 is 43042504.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76108176 + 329132164 = 8724^2 + 18142^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405240349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10130989 + ... + 10131028.

It is an arithmetic number, because the mean of its divisors is an integer number (70917063).

Almost surely, 2^405240340 is an apocalyptic number.

It is an amenable number.

405240340 is an abundant number, since it is smaller than the sum of its proper divisors (445764416).

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

405240340 is a wasteful number, since it uses less digits than its factorization.

405240340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20262026 (or 20262024 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 405240340 is about 20130.5822071792. The cubic root of 405240340 is about 740.0099462992.

Adding to 405240340 its reverse (43042504), we get a palindrome (448282844).

The spelling of 405240340 in words is "four hundred five million, two hundred forty thousand, three hundred forty".