7138888 has 32 divisors (see below), whose sum is σ = 13851000. Its totient is φ = 3447808.

The previous prime is 7138883. The next prime is 7138919. The reversal of 7138888 is 8888317.

It can be written as a sum of positive squares in 4 ways, for example, as 3305124 + 3833764 = 1818^2 + 1958^2 .

It is not an unprimeable number, because it can be changed into a prime (7138883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47838 + ... + 47986.

Almost surely, 2^7138888 is an apocalyptic number.

It is an amenable number.

7138888 is a deficient number, since it is larger than the sum of its proper divisors (6712112).

7138888 is a wasteful number, since it uses less digits than its factorization.

7138888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 317 counting only the distinct ones).

The product of its digits is 86016, while the sum is 43.

The square root of 7138888 is about 2671.8697573048. The cubic root of 7138888 is about 192.5499999427.

The spelling of 7138888 in words is "seven million, one hundred thirty-eight thousand, eight hundred eighty-eight".