7131388 has 24 divisors (see below), whose sum is σ = 13842864. Its totient is φ = 3187200.

The previous prime is 7131379. The next prime is 7131407. The reversal of 7131388 is 8831317.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1356 + ... + 4012.

It is an arithmetic number, because the mean of its divisors is an integer number (576786).

Almost surely, 2^7131388 is an apocalyptic number.

It is an amenable number.

7131388 is a deficient number, since it is larger than the sum of its proper divisors (6711476).

7131388 is a wasteful number, since it uses less digits than its factorization.

7131388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733 (or 2731 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 7131388 is about 2670.4658769586. The cubic root of 7131388 is about 192.4825463458.

The spelling of 7131388 in words is "seven million, one hundred thirty-one thousand, three hundred eighty-eight".