2129345 has 4 divisors (see below), whose sum is σ = 2555220. Its totient is φ = 1703472.

The previous prime is 2129333. The next prime is 2129353. The reversal of 2129345 is 5439212.

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 633616 + 1495729 = 796^2 + 1223^2 .

It is a cyclic number.

It is not a de Polignac number, because 2129345 - 2⁴ = 2129329 is a prime.

It is a super-2 number, since 2×2129345² = 9068220258050, which contains 22 as substring.

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212930 + ... + 212939.

It is an arithmetic number, because the mean of its divisors is an integer number (638805).

2^2129345 is an apocalyptic number.

It is an amenable number.

2129345 is a deficient number, since it is larger than the sum of its proper divisors (425875).

2129345 is an equidigital number, since it uses as much as digits as its factorization.

2129345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425874.

The product of its digits is 2160, while the sum is 26.

The square root of 2129345 is about 1459.2275353762. The cubic root of 2129345 is about 128.6516451213.

The spelling of 2129345 in words is "two million, one hundred twenty-nine thousand, three hundred forty-five".