345749 has 2 divisors, whose sum is σ = 345750. Its totient is φ = 345748.

The previous prime is 345739. The next prime is 345757. The reversal of 345749 is 947543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208849 + 136900 = 457^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 345749 - 2⁴ = 345733 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172874 + 172875.

It is an arithmetic number, because the mean of its divisors is an integer number (172875).

345749 is a Friedman number, since it can be written as 5+9*(7+4+3)^4, using all its digits and the basic arithmetic operations.

2³⁴⁵⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

345749 is a deficient number, since it is larger than the sum of its proper divisors (1).

345749 is an equidigital number, since it uses as much as digits as its factorization.

345749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 345749 is about 588.0042516853. The cubic root of 345749 is about 70.1865094219.

The spelling of 345749 in words is "three hundred forty-five thousand, seven hundred forty-nine".