645379 has 6 divisors (see below), whose sum is σ = 750804. Its totient is φ = 553140.

The previous prime is 645367. The next prime is 645383. The reversal of 645379 is 973546.

It is not a de Polignac number, because 645379 - 2⁵ = 645347 is a prime.

It is a Duffinian number.

645379 is a lucky number.

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 5 ways as a sum of consecutive naturals, for example, 6537 + ... + 6634.

It is an arithmetic number, because the mean of its divisors is an integer number (125134).

2⁶⁴⁵³⁷⁹ is an apocalyptic number.

645379 is a deficient number, since it is larger than the sum of its proper divisors (105425).

645379 is a wasteful number, since it uses less digits than its factorization.

645379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185 (or 13178 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The square root of 645379 is about 803.3548406526. The cubic root of 645379 is about 86.4181456944.

It can be divided in two parts, 64537 and 9, that added together give a palindrome (64546).

The spelling of 645379 in words is "six hundred forty-five thousand, three hundred seventy-nine".