69979 has 8 divisors (see below), whose sum is σ = 86240. Its totient is φ = 55296.

The previous prime is 69959. The next prime is 69991. The reversal of 69979 is 97996.

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

It is a 11-Lehmer number, since φ(69979) divides (69979-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 69979 - 2⁹ = 69467 is a prime.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (69929) 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, 294 + ... + 475.

It is an arithmetic number, because the mean of its divisors is an integer number (10780).

2⁶⁹⁹⁷⁹ is an apocalyptic number.

69979 is a deficient number, since it is larger than the sum of its proper divisors (16261).

69979 is a wasteful number, since it uses less digits than its factorization.

69979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789.

The product of its digits is 30618, while the sum is 40.

The square root of 69979 is about 264.5354418599. The cubic root of 69979 is about 41.2087313006.

The spelling of 69979 in words is "sixty-nine thousand, nine hundred seventy-nine".