645126 has 16 divisors (see below), whose sum is σ = 1358400.
Its totient is φ = 203688.
The previous prime is 645097. The next prime is 645131. The reversal of 645126 is 621546.
It is a junction number, because it is equal to n+sod(n) for n = 645096 and 645105.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2716 + ... + 2943.
It is an arithmetic number, because the mean of its divisors is an integer number (84900).
2645126 is an apocalyptic number.
645126 is an abundant number, since it is smaller than the sum of its proper divisors (713274).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
645126 is a wasteful number, since it uses less digits than its factorization.
645126 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5683.
The product of its digits is 1440, while the sum is 24.
The square root of 645126 is about 803.1973605534.
The cubic root of 645126 is about 86.4068517371.
The spelling of 645126 in words is "six hundred forty-five thousand, one hundred twenty-six".