7309138 has 4 divisors (see below), whose sum is σ = 10963710. Its totient is φ = 3654568.

The previous prime is 7309123. The next prime is 7309139. The reversal of 7309138 is 8319037.

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., 7112889 + 196249 = 2667^2 + 443^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7309139) 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, 1827283 + ... + 1827286.

Almost surely, 2^7309138 is an apocalyptic number.

7309138 is a deficient number, since it is larger than the sum of its proper divisors (3654572).

7309138 is a wasteful number, since it uses less digits than its factorization.

7309138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654571.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 7309138 is about 2703.5417511109. The cubic root of 7309138 is about 194.0686510852.

It can be divided in two parts, 7309 and 138, that added together give a palindrome (7447).

The spelling of 7309138 in words is "seven million, three hundred nine thousand, one hundred thirty-eight".