645339 has 8 divisors (see below), whose sum is σ = 870480. Its totient is φ = 425216.

The previous prime is 645329. The next prime is 645347. The reversal of 645339 is 933546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645339 - 2⁸ = 645083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942 + ... + 1475.

It is an arithmetic number, because the mean of its divisors is an integer number (108810).

2⁶⁴⁵³³⁹ is an apocalyptic number.

645339 is a deficient number, since it is larger than the sum of its proper divisors (225141).

645339 is a wasteful number, since it uses less digits than its factorization.

645339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509.

The product of its digits is 9720, while the sum is 30.

The square root of 645339 is about 803.3299446678. The cubic root of 645339 is about 86.4163602850.

The spelling of 645339 in words is "six hundred forty-five thousand, three hundred thirty-nine".