71898194 has 4 divisors (see below), whose sum is σ = 107847294. Its totient is φ = 35949096.

The previous prime is 71898191. The next prime is 71898209. The reversal of 71898194 is 49189817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49189817 = 149 ⋅330133.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 6692569 = 8075^2 + 2587^2 .

It is not an unprimeable number, because it can be changed into a prime (71898191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17974547 + ... + 17974550.

Almost surely, 2^71898194 is an apocalyptic number.

71898194 is a deficient number, since it is larger than the sum of its proper divisors (35949100).

71898194 is a wasteful number, since it uses less digits than its factorization.

71898194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35949099.

The product of its digits is 145152, while the sum is 47.

The square root of 71898194 is about 8479.2802760612. The cubic root of 71898194 is about 415.8205934047.

The spelling of 71898194 in words is "seventy-one million, eight hundred ninety-eight thousand, one hundred ninety-four".