705634421 has 4 divisors (see below), whose sum is σ = 718948332. Its totient is φ = 692320512.

The previous prime is 705634393. The next prime is 705634427. The reversal of 705634421 is 124436507.

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 383611396 + 322023025 = 19586^2 + 17945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705634421 is a prime.

It is a super-2 number, since 2×705634421² = 995839872200010482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705634427) 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, 6656876 + ... + 6656981.

It is an arithmetic number, because the mean of its divisors is an integer number (179737083).

Almost surely, 2^705634421 is an apocalyptic number.

It is an amenable number.

705634421 is a deficient number, since it is larger than the sum of its proper divisors (13313911).

705634421 is a wasteful number, since it uses less digits than its factorization.

705634421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13313910.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 705634421 is about 26563.7802467947. The cubic root of 705634421 is about 890.2799359281.

The spelling of 705634421 in words is "seven hundred five million, six hundred thirty-four thousand, four hundred twenty-one".