74917939 has 4 divisors (see below), whose sum is σ = 74972520. Its totient is φ = 74863360.

The previous prime is 74917937. The next prime is 74917949. The reversal of 74917939 is 93971947.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93971947 = 103 ⋅912349.

It is a cyclic number.

It is not a de Polignac number, because 74917939 - 2¹ = 74917937 is a prime.

It is a super-2 number, since 2×74917939² = 11225395168015442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74917892 and 74917901.

It is not an unprimeable number, because it can be changed into a prime (74917937) 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 3 ways as a sum of consecutive naturals, for example, 25177 + ... + 27994.

It is an arithmetic number, because the mean of its divisors is an integer number (18743130).

Almost surely, 2^74917939 is an apocalyptic number.

74917939 is a deficient number, since it is larger than the sum of its proper divisors (54581).

74917939 is a wasteful number, since it uses less digits than its factorization.

74917939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54580.

The product of its digits is 428652, while the sum is 49.

The square root of 74917939 is about 8655.5149471305. The cubic root of 74917939 is about 421.5624700146.

The spelling of 74917939 in words is "seventy-four million, nine hundred seventeen thousand, nine hundred thirty-nine".