71893138 has 4 divisors (see below), whose sum is σ = 107839710. Its totient is φ = 35946568.

The previous prime is 71893121. The next prime is 71893181. The reversal of 71893138 is 83139817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83139817 = 191 ⋅435287.

It can be written as a sum of positive squares in only one way, i.e., 39778249 + 32114889 = 6307^2 + 5667^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71893138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17973283 + ... + 17973286.

Almost surely, 2^71893138 is an apocalyptic number.

71893138 is a deficient number, since it is larger than the sum of its proper divisors (35946572).

71893138 is a wasteful number, since it uses less digits than its factorization.

71893138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35946571.

The product of its digits is 36288, while the sum is 40.

The square root of 71893138 is about 8478.9821323081. The cubic root of 71893138 is about 415.8108461121.

The spelling of 71893138 in words is "seventy-one million, eight hundred ninety-three thousand, one hundred thirty-eight".