705021 has 4 divisors (see below), whose sum is σ = 940032. Its totient is φ = 470012.

The previous prime is 705017. The next prime is 705031. The reversal of 705021 is 120507.

It is a happy number.

705021 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120507 = 3 ⋅40169.

It is a cyclic number.

It is not a de Polignac number, because 705021 - 2² = 705017 is a prime.

It is a super-2 number, since 2×705021² = 994109220882, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

705021 is a lucky number.

It is a nialpdrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705011) 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, 117501 + ... + 117506.

It is an arithmetic number, because the mean of its divisors is an integer number (235008).

2⁷⁰⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

705021 is a deficient number, since it is larger than the sum of its proper divisors (235011).

705021 is a wasteful number, since it uses less digits than its factorization.

705021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235010.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 705021 is about 839.6552864122. The cubic root of 705021 is about 89.0021882221.

Adding to 705021 its reverse (120507), we get a palindrome (825528).

The spelling of 705021 in words is "seven hundred five thousand, twenty-one".