74329391 has 4 divisors (see below), whose sum is σ = 74380800. Its totient is φ = 74277984.

The previous prime is 74329357. The next prime is 74329393. The reversal of 74329391 is 19392347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19392347 = 13 ⋅1491719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74329391 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 (74329393) 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, 23471 + ... + 26448.

It is an arithmetic number, because the mean of its divisors is an integer number (18595200).

Almost surely, 2^74329391 is an apocalyptic number.

74329391 is a deficient number, since it is larger than the sum of its proper divisors (51409).

74329391 is a wasteful number, since it uses less digits than its factorization.

74329391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51408.

The product of its digits is 40824, while the sum is 38.

The square root of 74329391 is about 8621.4494721015. The cubic root of 74329391 is about 420.4556487331.

The spelling of 74329391 in words is "seventy-four million, three hundred twenty-nine thousand, three hundred ninety-one".