669396 has 48 divisors (see below), whose sum is σ = 1925504. Its totient is φ = 176256.

The previous prime is 669391. The next prime is 669401. The reversal of 669396 is 693966.

669396 = T₄₃ + T₄₄ + ... + T₁₅₉.

669396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669391) and next prime (669401).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669391) by changing a digit.

669396 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 15 ways as a sum of consecutive naturals, for example, 786 + ... + 1398.

2⁶⁶⁹³⁹⁶ 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 669396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962752).

669396 is an abundant number, since it is smaller than the sum of its proper divisors (1256108).

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

669396 is a wasteful number, since it uses less digits than its factorization.

669396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 638 counting only the distinct ones).

The product of its digits is 52488, while the sum is 39.

The square root of 669396 is about 818.1662422760. The cubic root of 669396 is about 87.4770987685.

The spelling of 669396 in words is "six hundred sixty-nine thousand, three hundred ninety-six".