74992171 has 4 divisors (see below), whose sum is σ = 75030192. Its totient is φ = 74954152.

The previous prime is 74992133. The next prime is 74992199. The reversal of 74992171 is 17129947.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74992171 is a prime.

It is a super-2 number, since 2×74992171² = 11247651422586482, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74992571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15880 + ... + 20053.

It is an arithmetic number, because the mean of its divisors is an integer number (18757548).

Almost surely, 2^74992171 is an apocalyptic number.

74992171 is a deficient number, since it is larger than the sum of its proper divisors (38021).

74992171 is a wasteful number, since it uses less digits than its factorization.

74992171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38020.

The product of its digits is 31752, while the sum is 40.

The square root of 74992171 is about 8659.8020185221. The cubic root of 74992171 is about 421.7016582862.

The spelling of 74992171 in words is "seventy-four million, nine hundred ninety-two thousand, one hundred seventy-one".