705214721 has 4 divisors (see below), whose sum is σ = 729532500. Its totient is φ = 680896944.

The previous prime is 705214687. The next prime is 705214747. The reversal of 705214721 is 127412507.

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 117831025 + 587383696 = 10855^2 + 24236^2 .

It is a cyclic number.

It is not a de Polignac number, because 705214721 - 2¹⁰ = 705213697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 24317749 = 705214721 / (7 + 0 + 5 + 2 + 1 + 4 + 7 + 2 + 1).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (705214021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12158846 + ... + 12158903.

It is an arithmetic number, because the mean of its divisors is an integer number (182383125).

Almost surely, 2^705214721 is an apocalyptic number.

It is an amenable number.

705214721 is a deficient number, since it is larger than the sum of its proper divisors (24317779).

705214721 is a wasteful number, since it uses less digits than its factorization.

705214721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24317778.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 705214721 is about 26555.8792172280. The cubic root of 705214721 is about 890.1033928613.

The spelling of 705214721 in words is "seven hundred five million, two hundred fourteen thousand, seven hundred twenty-one".