71904138 has 8 divisors (see below), whose sum is σ = 143808288. Its totient is φ = 23968044.

The previous prime is 71904103. The next prime is 71904143. The reversal of 71904138 is 83140917.

It is a sphenic number, since it is the product of 3 distinct primes.

71904138 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 71904099 and 71904108.

It is an unprimeable number.

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, 5992006 + ... + 5992017.

It is an arithmetic number, because the mean of its divisors is an integer number (17976036).

Almost surely, 2^71904138 is an apocalyptic number.

71904138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71904138 is a wasteful number, since it uses less digits than its factorization.

71904138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11984028.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 71904138 is about 8479.6307702635. The cubic root of 71904138 is about 415.8320520583.

The spelling of 71904138 in words is "seventy-one million, nine hundred four thousand, one hundred thirty-eight".