74393906 has 4 divisors (see below), whose sum is σ = 111590862. Its totient is φ = 37196952.

The previous prime is 74393899. The next prime is 74393909. The reversal of 74393906 is 60939347.

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

It can be written as a sum of positive squares in only one way, i.e., 71554681 + 2839225 = 8459^2 + 1685^2 .

It is not an unprimeable number, because it can be changed into a prime (74393909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18598475 + ... + 18598478.

Almost surely, 2^74393906 is an apocalyptic number.

74393906 is a deficient number, since it is larger than the sum of its proper divisors (37196956).

74393906 is a wasteful number, since it uses less digits than its factorization.

74393906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37196955.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 74393906 is about 8625.1902008014. The cubic root of 74393906 is about 420.5772599001.

It can be divided in two parts, 743 and 93906, that added together give a palindrome (94649).

The spelling of 74393906 in words is "seventy-four million, three hundred ninety-three thousand, nine hundred six".