71998189 has 8 divisors (see below), whose sum is σ = 74988288. Its totient is φ = 69063120.

The previous prime is 71998187. The next prime is 71998207. The reversal of 71998189 is 98189917.

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

It is not a de Polignac number, because 71998189 - 2¹ = 71998187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71998187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11077 + ... + 16330.

It is an arithmetic number, because the mean of its divisors is an integer number (9373536).

Almost surely, 2^71998189 is an apocalyptic number.

It is an amenable number.

71998189 is a deficient number, since it is larger than the sum of its proper divisors (2990099).

71998189 is a wasteful number, since it uses less digits than its factorization.

71998189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27515.

The product of its digits is 326592, while the sum is 52.

The square root of 71998189 is about 8485.1746593691. The cubic root of 71998189 is about 416.0132765887.

The spelling of 71998189 in words is "seventy-one million, nine hundred ninety-eight thousand, one hundred eighty-nine".