74399779 has 4 divisors (see below), whose sum is σ = 77634576. Its totient is φ = 71164984.

The previous prime is 74399777. The next prime is 74399797. The reversal of 74399779 is 97799347.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 74399779 - 2¹ = 74399777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74399777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617364 + ... + 1617409.

It is an arithmetic number, because the mean of its divisors is an integer number (19408644).

Almost surely, 2^74399779 is an apocalyptic number.

74399779 is a deficient number, since it is larger than the sum of its proper divisors (3234797).

74399779 is a wasteful number, since it uses less digits than its factorization.

74399779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234796.

The product of its digits is 3000564, while the sum is 55.

The square root of 74399779 is about 8625.5306503426. The cubic root of 74399779 is about 420.5883270487.

The spelling of 74399779 in words is "seventy-four million, three hundred ninety-nine thousand, seven hundred seventy-nine".