669790939 has 8 divisors (see below), whose sum is σ = 715698720. Its totient is φ = 624606336.

The previous prime is 669790861. The next prime is 669790943. The reversal of 669790939 is 939097966.

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

It is a cyclic number.

It is not a de Polignac number, because 669790939 - 2⁹ = 669790427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669790039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178879 + ... + 182584.

It is an arithmetic number, because the mean of its divisors is an integer number (89462340).

Almost surely, 2^669790939 is an apocalyptic number.

669790939 is a deficient number, since it is larger than the sum of its proper divisors (45907781).

669790939 is a wasteful number, since it uses less digits than its factorization.

669790939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361589.

The product of its (nonzero) digits is 4960116, while the sum is 58.

The square root of 669790939 is about 25880.3195304849. The cubic root of 669790939 is about 874.9429901360.

The spelling of 669790939 in words is "six hundred sixty-nine million, seven hundred ninety thousand, nine hundred thirty-nine".