7138540 has 12 divisors (see below), whose sum is σ = 14990976. Its totient is φ = 2855408.

The previous prime is 7138513. The next prime is 7138541. The reversal of 7138540 is 458317.

It is a junction number, because it is equal to n+sod(n) for n = 7138499 and 7138508.

It is not an unprimeable number, because it can be changed into a prime (7138541) 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, 178444 + ... + 178483.

It is an arithmetic number, because the mean of its divisors is an integer number (1249248).

Almost surely, 2^7138540 is an apocalyptic number.

It is an amenable number.

7138540 is an abundant number, since it is smaller than the sum of its proper divisors (7852436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7138540 is a wasteful number, since it uses less digits than its factorization.

7138540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356936 (or 356934 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 7138540 is about 2671.8046335763. The cubic root of 7138540 is about 192.5468711413.

The spelling of 7138540 in words is "seven million, one hundred thirty-eight thousand, five hundred forty".