7138247 has 4 divisors (see below), whose sum is σ = 7244856. Its totient is φ = 7031640.

The previous prime is 7138237. The next prime is 7138273. The reversal of 7138247 is 7428317.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7428317 = 13 ⋅571409.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7138247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53204 + ... + 53337.

It is an arithmetic number, because the mean of its divisors is an integer number (1811214).

Almost surely, 2^7138247 is an apocalyptic number.

7138247 is a deficient number, since it is larger than the sum of its proper divisors (106609).

7138247 is a wasteful number, since it uses less digits than its factorization.

7138247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106608.

The product of its digits is 9408, while the sum is 32.

The square root of 7138247 is about 2671.7498011603. The cubic root of 7138247 is about 192.5442367555.

The spelling of 7138247 in words is "seven million, one hundred thirty-eight thousand, two hundred forty-seven".