669838 has 8 divisors (see below), whose sum is σ = 1082088. Its totient is φ = 309144.

The previous prime is 669791. The next prime is 669839. The reversal of 669838 is 838966.

669838 = 87² + 88² + ... + 138².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 669838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12856 + ... + 12907.

It is an arithmetic number, because the mean of its divisors is an integer number (135261).

2⁶⁶⁹⁸³⁸ is an apocalyptic number.

669838 is a deficient number, since it is larger than the sum of its proper divisors (412250).

669838 is a wasteful number, since it uses less digits than its factorization.

669838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25778.

The product of its digits is 62208, while the sum is 40.

The square root of 669838 is about 818.4363139548. The cubic root of 669838 is about 87.4963481469.

The spelling of 669838 in words is "six hundred sixty-nine thousand, eight hundred thirty-eight".