645246 has 40 divisors (see below), whose sum is σ = 1655280. Its totient is φ = 184032.

The previous prime is 645233. The next prime is 645257. The reversal of 645246 is 642546.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 850 + ... + 1418.

It is an arithmetic number, because the mean of its divisors is an integer number (41382).

2⁶⁴⁵²⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827640).

645246 is an abundant number, since it is smaller than the sum of its proper divisors (1010034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645246 is a wasteful number, since it uses less digits than its factorization.

645246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 581 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 645246 is about 803.2720585206. The cubic root of 645246 is about 86.4122089229.

The spelling of 645246 in words is "six hundred forty-five thousand, two hundred forty-six".