74399731 has 16 divisors (see below), whose sum is σ = 87736320. Its totient is φ = 61768800.

The previous prime is 74399729. The next prime is 74399737. The reversal of 74399731 is 13799347.

It is a cyclic number.

It is not a de Polignac number, because 74399731 - 2¹ = 74399729 is a prime.

It is a super-2 number, since 2×74399731² = 11070639945744722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74399737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32110 + ... + 34348.

It is an arithmetic number, because the mean of its divisors is an integer number (5483520).

Almost surely, 2^74399731 is an apocalyptic number.

74399731 is a deficient number, since it is larger than the sum of its proper divisors (13336589).

74399731 is a wasteful number, since it uses less digits than its factorization.

74399731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394.

The product of its digits is 142884, while the sum is 43.

The square root of 74399731 is about 8625.5278679047. The cubic root of 74399731 is about 420.5882365993.

The spelling of 74399731 in words is "seventy-four million, three hundred ninety-nine thousand, seven hundred thirty-one".