745391 has 2 divisors, whose sum is σ = 745392. Its totient is φ = 745390.

The previous prime is 745379. The next prime is 745397. The reversal of 745391 is 193547.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 745391 - 2¹⁸ = 483247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372695 + 372696.

It is an arithmetic number, because the mean of its divisors is an integer number (372696).

2⁷⁴⁵³⁹¹ is an apocalyptic number.

745391 is a deficient number, since it is larger than the sum of its proper divisors (1).

745391 is an equidigital number, since it uses as much as digits as its factorization.

745391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 29.

The square root of 745391 is about 863.3602955893. The cubic root of 745391 is about 90.6695335623.

The spelling of 745391 in words is "seven hundred forty-five thousand, three hundred ninety-one".