405704693 has 4 divisors (see below), whose sum is σ = 419694540. Its totient is φ = 391714848.

The previous prime is 405704671. The next prime is 405704707. The reversal of 405704693 is 396407504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204547204 + 201157489 = 14302^2 + 14183^2 .

It is a cyclic number.

It is not a de Polignac number, because 405704693 - 2¹⁸ = 405442549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405704633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6994880 + ... + 6994937.

It is an arithmetic number, because the mean of its divisors is an integer number (104923635).

Almost surely, 2^405704693 is an apocalyptic number.

It is an amenable number.

405704693 is a deficient number, since it is larger than the sum of its proper divisors (13989847).

405704693 is a wasteful number, since it uses less digits than its factorization.

405704693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13989846.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 405704693 is about 20142.1124264562. The cubic root of 405704693 is about 740.2924902926.

The spelling of 405704693 in words is "four hundred five million, seven hundred four thousand, six hundred ninety-three".