7138391 has 6 divisors (see below), whose sum is σ = 7729920. Its totient is φ = 6589128.

The previous prime is 7138367. The next prime is 7138393. The reversal of 7138391 is 1938317.

It is not a de Polignac number, because 7138391 - 2¹⁴ = 7122007 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 (7138393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20951 + ... + 21288.

It is an arithmetic number, because the mean of its divisors is an integer number (1288320).

Almost surely, 2^7138391 is an apocalyptic number.

7138391 is a deficient number, since it is larger than the sum of its proper divisors (591529).

7138391 is a wasteful number, since it uses less digits than its factorization.

7138391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42265 (or 42252 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 7138391 is about 2671.7767496556. The cubic root of 7138391 is about 192.5455314797.

The spelling of 7138391 in words is "seven million, one hundred thirty-eight thousand, three hundred ninety-one".