71873999 has 4 divisors (see below), whose sum is σ = 72440064. Its totient is φ = 71307936.

The previous prime is 71873983. The next prime is 71874001. The reversal of 71873999 is 99937817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99937817 = 7 ⋅14276831.

It is a cyclic number.

It is not a de Polignac number, because 71873999 - 2⁴ = 71873983 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 71873999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71873929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282842 + ... + 283095.

It is an arithmetic number, because the mean of its divisors is an integer number (18110016).

Almost surely, 2^71873999 is an apocalyptic number.

71873999 is a deficient number, since it is larger than the sum of its proper divisors (566065).

71873999 is a wasteful number, since it uses less digits than its factorization.

71873999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566064.

The product of its digits is 857304, while the sum is 53.

The square root of 71873999 is about 8477.8534429418. The cubic root of 71873999 is about 415.7739445371.

The spelling of 71873999 in words is "seventy-one million, eight hundred seventy-three thousand, nine hundred ninety-nine".