7138861 has 4 divisors (see below), whose sum is σ = 7558812. Its totient is φ = 6718912.

The previous prime is 7138853. The next prime is 7138867. The reversal of 7138861 is 1688317.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4076361 + 3062500 = 2019^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 7138861 - 2³ = 7138853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138867) 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, 209950 + ... + 209983.

It is an arithmetic number, because the mean of its divisors is an integer number (1889703).

Almost surely, 2^7138861 is an apocalyptic number.

It is an amenable number.

7138861 is a deficient number, since it is larger than the sum of its proper divisors (419951).

7138861 is a wasteful number, since it uses less digits than its factorization.

7138861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419950.

The product of its digits is 8064, while the sum is 34.

The square root of 7138861 is about 2671.8647046585. The cubic root of 7138861 is about 192.5497571945.

The spelling of 7138861 in words is "seven million, one hundred thirty-eight thousand, eight hundred sixty-one".