73909138 has 4 divisors (see below), whose sum is σ = 110863710. Its totient is φ = 36954568.

The previous prime is 73909127. The next prime is 73909141. The reversal of 73909138 is 83190937.

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., 73908409 + 729 = 8597^2 + 27^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 73909138.

It is an unprimeable number.

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, 18477283 + ... + 18477286.

Almost surely, 2^73909138 is an apocalyptic number.

73909138 is a deficient number, since it is larger than the sum of its proper divisors (36954572).

73909138 is a wasteful number, since it uses less digits than its factorization.

73909138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36954571.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 73909138 is about 8597.0423984066. The cubic root of 73909138 is about 419.6617420095.

It can be divided in two parts, 73909 and 138, that added together give a palindrome (74047).

The spelling of 73909138 in words is "seventy-three million, nine hundred nine thousand, one hundred thirty-eight".