405240394 has 16 divisors (see below), whose sum is σ = 657119232. Its totient is φ = 186319728.

The previous prime is 405240377. The next prime is 405240431. The reversal of 405240394 is 493042504.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22794 + ... + 36469.

It is an arithmetic number, because the mean of its divisors is an integer number (41069952).

Almost surely, 2^405240394 is an apocalyptic number.

405240394 is a deficient number, since it is larger than the sum of its proper divisors (251878838).

405240394 is a wasteful number, since it uses less digits than its factorization.

405240394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59541.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 405240394 is about 20130.5835484220. The cubic root of 405240394 is about 740.0099791691.

Adding to 405240394 its reverse (493042504), we get a palindrome (898282898).

The spelling of 405240394 in words is "four hundred five million, two hundred forty thousand, three hundred ninety-four".