69949447 has 4 divisors (see below), whose sum is σ = 69966520. Its totient is φ = 69932376.

The previous prime is 69949379. The next prime is 69949501. The reversal of 69949447 is 74494996.

It is a happy number.

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

It is a 3-Lehmer number, since φ(69949447) divides (69949447-1)³.

It is a cyclic number.

It is not a de Polignac number, because 69949447 - 2¹¹ = 69947399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 69949394 and 69949403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69941447) 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, 1708 + ... + 11950.

It is an arithmetic number, because the mean of its divisors is an integer number (17491630).

Almost surely, 2^69949447 is an apocalyptic number.

69949447 is the 6829-th pentagonal number.

69949447 is a deficient number, since it is larger than the sum of its proper divisors (17073).

69949447 is a wasteful number, since it uses less digits than its factorization.

69949447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17072.

The product of its digits is 1959552, while the sum is 52.

The square root of 69949447 is about 8363.5786000970. The cubic root of 69949447 is about 412.0292949761.

The spelling of 69949447 in words is "sixty-nine million, nine hundred forty-nine thousand, four hundred forty-seven".