74391899 has 4 divisors (see below), whose sum is σ = 74412360. Its totient is φ = 74371440.

The previous prime is 74391869. The next prime is 74391907. The reversal of 74391899 is 99819347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99819347 = 67 ⋅1489841.

It is a cyclic number.

It is not a de Polignac number, because 74391899 - 2²⁰ = 73343323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74391839) 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, 3137 + ... + 12594.

It is an arithmetic number, because the mean of its divisors is an integer number (18603090).

Almost surely, 2^74391899 is an apocalyptic number.

74391899 is a deficient number, since it is larger than the sum of its proper divisors (20461).

74391899 is a wasteful number, since it uses less digits than its factorization.

74391899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20460.

The product of its digits is 489888, while the sum is 50.

The square root of 74391899 is about 8625.0738547563. The cubic root of 74391899 is about 420.5734777527.

The spelling of 74391899 in words is "seventy-four million, three hundred ninety-one thousand, eight hundred ninety-nine".