74319981 has 8 divisors (see below), whose sum is σ = 99413184. Its totient is φ = 49386720.

The previous prime is 74319979. The next prime is 74319983. The reversal of 74319981 is 18991347.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (74319979) and next prime (74319983).

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

It is not a de Polignac number, because 74319981 - 2¹ = 74319979 is a prime.

It is a super-2 number, since 2×74319981² = 11046919151680722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74319983) 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, 38896 + ... + 40761.

It is an arithmetic number, because the mean of its divisors is an integer number (12426648).

Almost surely, 2^74319981 is an apocalyptic number.

It is an amenable number.

74319981 is a deficient number, since it is larger than the sum of its proper divisors (25093203).

74319981 is a wasteful number, since it uses less digits than its factorization.

74319981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79971.

The product of its digits is 54432, while the sum is 42.

The square root of 74319981 is about 8620.9037229284. The cubic root of 74319981 is about 420.4379049461.

The spelling of 74319981 in words is "seventy-four million, three hundred nineteen thousand, nine hundred eighty-one".