7138657 has 4 divisors (see below), whose sum is σ = 7558596. Its totient is φ = 6718720.

The previous prime is 7138643. The next prime is 7138673. The reversal of 7138657 is 7568317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7568317 = 421 ⋅17977.

It can be written as a sum of positive squares in 2 ways, for example, as 4124961 + 3013696 = 2031^2 + 1736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7138657 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7138697) 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 in 3 ways as a sum of consecutive naturals, for example, 209944 + ... + 209977.

It is an arithmetic number, because the mean of its divisors is an integer number (1889649).

Almost surely, 2^7138657 is an apocalyptic number.

It is an amenable number.

7138657 is a deficient number, since it is larger than the sum of its proper divisors (419939).

7138657 is a wasteful number, since it uses less digits than its factorization.

7138657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419938.

The product of its digits is 35280, while the sum is 37.

The square root of 7138657 is about 2671.8265288001. The cubic root of 7138657 is about 192.5479230772.

The spelling of 7138657 in words is "seven million, one hundred thirty-eight thousand, six hundred fifty-seven".