74123391 has 16 divisors (see below), whose sum is σ = 102463200. Its totient is φ = 47607168.

The previous prime is 74123381. The next prime is 74123419. The reversal of 74123391 is 19332147.

It is not a de Polignac number, because 74123391 - 2⁵ = 74123359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74123341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68805 + ... + 69873.

It is an arithmetic number, because the mean of its divisors is an integer number (6403950).

Almost surely, 2^74123391 is an apocalyptic number.

74123391 is a deficient number, since it is larger than the sum of its proper divisors (28339809).

74123391 is a wasteful number, since it uses less digits than its factorization.

74123391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 4536, while the sum is 30.

The square root of 74123391 is about 8609.4942360164. The cubic root of 74123391 is about 420.0668657714.

The spelling of 74123391 in words is "seventy-four million, one hundred twenty-three thousand, three hundred ninety-one".