71999347 has 8 divisors (see below), whose sum is σ = 84036096. Its totient is φ = 60400392.

The previous prime is 71999311. The next prime is 71999351. The reversal of 71999347 is 74399917.

It is a happy number.

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 71999347 - 2¹⁵ = 71966579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71999347.

It is not an unprimeable number, because it can be changed into a prime (71999047) 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, 109093 + ... + 109750.

It is an arithmetic number, because the mean of its divisors is an integer number (10504512).

Almost surely, 2^71999347 is an apocalyptic number.

71999347 is a deficient number, since it is larger than the sum of its proper divisors (12036749).

71999347 is a wasteful number, since it uses less digits than its factorization.

71999347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218897.

The product of its digits is 428652, while the sum is 49.

The square root of 71999347 is about 8485.2428957573. The cubic root of 71999347 is about 416.0155069263.

The spelling of 71999347 in words is "seventy-one million, nine hundred ninety-nine thousand, three hundred forty-seven".