669340 has 36 divisors (see below), whose sum is σ = 1637496. Its totient is φ = 229152.

The previous prime is 669329. The next prime is 669359. The reversal of 669340 is 43966.

669340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 669299 and 669308.

It is a congruent number.

It is an unprimeable number.

669340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (45486).

2⁶⁶⁹³⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818748).

669340 is an abundant number, since it is smaller than the sum of its proper divisors (968156).

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

669340 is a wasteful number, since it uses less digits than its factorization.

669340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 669340 is about 818.1320186865. The cubic root of 669340 is about 87.4746593285.

The spelling of 669340 in words is "six hundred sixty-nine thousand, three hundred forty".