7280138 has 8 divisors (see below), whose sum is σ = 11017188. Its totient is φ = 3607744.

The previous prime is 7280137. The next prime is 7280149. The reversal of 7280138 is 8310827.

It can be written as a sum of positive squares in 2 ways, for example, as 7252249 + 27889 = 2693^2 + 167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7280138.

It is not an unprimeable number, because it can be changed into a prime (7280137) 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, 15881 + ... + 16332.

Almost surely, 2^7280138 is an apocalyptic number.

7280138 is a deficient number, since it is larger than the sum of its proper divisors (3737050).

7280138 is a wasteful number, since it uses less digits than its factorization.

7280138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32328.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 7280138 is about 2698.1730856266. The cubic root of 7280138 is about 193.8116462872.

The spelling of 7280138 in words is "seven million, two hundred eighty thousand, one hundred thirty-eight".