69897921 has 8 divisors (see below), whose sum is σ = 95716224. Its totient is φ = 45339120.

The previous prime is 69897913. The next prime is 69897923. The reversal of 69897921 is 12979896.

It is a happy number.

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

It is not a de Polignac number, because 69897921 - 2³ = 69897913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (69897923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314745 + ... + 314966.

It is an arithmetic number, because the mean of its divisors is an integer number (11964528).

Almost surely, 2^69897921 is an apocalyptic number.

It is an amenable number.

69897921 is a deficient number, since it is larger than the sum of its proper divisors (25818303).

69897921 is a wasteful number, since it uses less digits than its factorization.

69897921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629751.

The product of its digits is 489888, while the sum is 51.

The square root of 69897921 is about 8360.4976526520. The cubic root of 69897921 is about 411.9281007691.

The spelling of 69897921 in words is "sixty-nine million, eight hundred ninety-seven thousand, nine hundred twenty-one".