74123981 has 8 divisors (see below), whose sum is σ = 75289080. Its totient is φ = 72963072.

The previous prime is 74123977. The next prime is 74123993. The reversal of 74123981 is 18932147.

It can be written as a sum of positive squares in 4 ways, for example, as 13205956 + 60918025 = 3634^2 + 7805^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 74123981 - 2² = 74123977 is a prime.

It is a super-2 number, since 2×74123981² = 10988729118576722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74123911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67271 + ... + 68363.

It is an arithmetic number, because the mean of its divisors is an integer number (9411135).

Almost surely, 2^74123981 is an apocalyptic number.

It is an amenable number.

74123981 is a deficient number, since it is larger than the sum of its proper divisors (1165099).

74123981 is a wasteful number, since it uses less digits than its factorization.

74123981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095.

The product of its digits is 12096, while the sum is 35.

The square root of 74123981 is about 8609.5285004465. The cubic root of 74123981 is about 420.0679803039.

The spelling of 74123981 in words is "seventy-four million, one hundred twenty-three thousand, nine hundred eighty-one".