7217138388 has 24 divisors (see below), whose sum is σ = 16846556608. Its totient is φ = 2404774656.

The previous prime is 7217138381. The next prime is 7217138407. The reversal of 7217138388 is 8838317127.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7217138381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84856 + ... + 147087.

Almost surely, 2^7217138388 is an apocalyptic number.

It is an amenable number.

7217138388 is an abundant number, since it is smaller than the sum of its proper divisors (9629418220).

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

7217138388 is a wasteful number, since it uses less digits than its factorization.

7217138388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234543 (or 234541 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 7217138388 is about 84953.7426368021. The cubic root of 7217138388 is about 1932.5096784664.

The spelling of 7217138388 in words is "seven billion, two hundred seventeen million, one hundred thirty-eight thousand, three hundred eighty-eight".