71993418 has 32 divisors (see below), whose sum is σ = 164989440. Its totient is φ = 20515440.

The previous prime is 71993353. The next prime is 71993423. The reversal of 71993418 is 81439917.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 71993418.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15553 + ... + 19643.

It is an arithmetic number, because the mean of its divisors is an integer number (5155920).

Almost surely, 2^71993418 is an apocalyptic number.

71993418 is an abundant number, since it is smaller than the sum of its proper divisors (92996022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71993418 is a wasteful number, since it uses less digits than its factorization.

71993418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4522.

The product of its digits is 54432, while the sum is 42.

The square root of 71993418 is about 8484.8935173047. The cubic root of 71993418 is about 416.0040872688.

The spelling of 71993418 in words is "seventy-one million, nine hundred ninety-three thousand, four hundred eighteen".