69979921 has 8 divisors (see below), whose sum is σ = 76944384. Its totient is φ = 63115920.

The previous prime is 69979901. The next prime is 69979979. The reversal of 69979921 is 12997996.

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 69979921 - 2¹³ = 69971729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (69979901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23650 + ... + 26443.

It is an arithmetic number, because the mean of its divisors is an integer number (9618048).

Almost surely, 2^69979921 is an apocalyptic number.

It is an amenable number.

69979921 is a deficient number, since it is larger than the sum of its proper divisors (6964463).

69979921 is a wasteful number, since it uses less digits than its factorization.

69979921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50231.

The product of its digits is 551124, while the sum is 52.

The square root of 69979921 is about 8365.4002295168. The cubic root of 69979921 is about 412.0891208375.

The spelling of 69979921 in words is "sixty-nine million, nine hundred seventy-nine thousand, nine hundred twenty-one".