405665342 has 16 divisors (see below), whose sum is σ = 614153232. Its totient is φ = 200952960.

The previous prime is 405665279. The next prime is 405665363. The reversal of 405665342 is 243566504.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260438 + ... + 261990.

It is an arithmetic number, because the mean of its divisors is an integer number (38384577).

Almost surely, 2^405665342 is an apocalyptic number.

405665342 is a deficient number, since it is larger than the sum of its proper divisors (208487890).

405665342 is a wasteful number, since it uses less digits than its factorization.

405665342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 405665342 is about 20141.1355687806. The cubic root of 405665342 is about 740.2685548274.

The spelling of 405665342 in words is "four hundred five million, six hundred sixty-five thousand, three hundred forty-two".