7138228 has 6 divisors (see below), whose sum is σ = 12491906. Its totient is φ = 3569112.

The previous prime is 7138217. The next prime is 7138237. The reversal of 7138228 is 8228317.

It can be written as a sum of positive squares in only one way, i.e., 7086244 + 51984 = 2662^2 + 228^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7138228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 892275 + ... + 892282.

Almost surely, 2^7138228 is an apocalyptic number.

It is an amenable number.

7138228 is a deficient number, since it is larger than the sum of its proper divisors (5353678).

7138228 is a wasteful number, since it uses less digits than its factorization.

7138228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784561 (or 1784559 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 7138228 is about 2671.7462454357. The cubic root of 7138228 is about 192.5440659225.

The spelling of 7138228 in words is "seven million, one hundred thirty-eight thousand, two hundred twenty-eight".