7138281 has 16 divisors (see below), whose sum is σ = 10187840. Its totient is φ = 4432320.

The previous prime is 7138279. The next prime is 7138297. The reversal of 7138281 is 1828317.

It is a happy number.

It is not a de Polignac number, because 7138281 - 2¹ = 7138279 is a prime.

It is a super-2 number, since 2×7138281² = 101910111269922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7138981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2451 + ... + 4503.

It is an arithmetic number, because the mean of its divisors is an integer number (636740).

Almost surely, 2^7138281 is an apocalyptic number.

It is an amenable number.

7138281 is a deficient number, since it is larger than the sum of its proper divisors (3049559).

7138281 is a wasteful number, since it uses less digits than its factorization.

7138281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136.

The product of its digits is 2688, while the sum is 30.

The square root of 7138281 is about 2671.7561640240. The cubic root of 7138281 is about 192.5445424558.

The spelling of 7138281 in words is "seven million, one hundred thirty-eight thousand, two hundred eighty-one".