669131438 has 8 divisors (see below), whose sum is σ = 1007514288. Its totient is φ = 333293344.

The previous prime is 669131431. The next prime is 669131443. The reversal of 669131438 is 834131966.

669131438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 669131395 and 669131404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669131431) 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, 635531 + ... + 636582.

It is an arithmetic number, because the mean of its divisors is an integer number (125939286).

Almost surely, 2^669131438 is an apocalyptic number.

669131438 is a deficient number, since it is larger than the sum of its proper divisors (338382850).

669131438 is a wasteful number, since it uses less digits than its factorization.

669131438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272378.

The product of its digits is 93312, while the sum is 41.

The square root of 669131438 is about 25867.5750313013. The cubic root of 669131438 is about 874.6557287265.

The spelling of 669131438 in words is "six hundred sixty-nine million, one hundred thirty-one thousand, four hundred thirty-eight".