69404921 has 4 divisors (see below), whose sum is σ = 69424500. Its totient is φ = 69385344.

The previous prime is 69404899. The next prime is 69404927. The reversal of 69404921 is 12940496.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64722025 + 4682896 = 8045^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 69404921 - 2⁶ = 69404857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (69404927) 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 3 ways as a sum of consecutive naturals, for example, 2816 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (17356125).

Almost surely, 2^69404921 is an apocalyptic number.

It is an amenable number.

69404921 is a deficient number, since it is larger than the sum of its proper divisors (19579).

69404921 is a wasteful number, since it uses less digits than its factorization.

69404921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19578.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 69404921 is about 8330.9615891564. The cubic root of 69404921 is about 410.9573523668.

The spelling of 69404921 in words is "sixty-nine million, four hundred four thousand, nine hundred twenty-one".