1669139879 has 8 divisors (see below), whose sum is σ = 1821180672. Its totient is φ = 1517149240.

The previous prime is 1669139861. The next prime is 1669139881. The reversal of 1669139879 is 9789319661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669139879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669139579) 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, 105032 + ... + 119874.

It is an arithmetic number, because the mean of its divisors is an integer number (227647584).

Almost surely, 2^1669139879 is an apocalyptic number.

1669139879 is a deficient number, since it is larger than the sum of its proper divisors (152040793).

1669139879 is a wasteful number, since it uses less digits than its factorization.

1669139879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25077.

The product of its digits is 4408992, while the sum is 59.

The square root of 1669139879 is about 40855.1083586863. The cubic root of 1669139879 is about 1186.2172751385.

The spelling of 1669139879 in words is "one billion, six hundred sixty-nine million, one hundred thirty-nine thousand, eight hundred seventy-nine".