40138228 has 12 divisors (see below), whose sum is σ = 75645220. Its totient is φ = 18525312.

The previous prime is 40138201. The next prime is 40138237. The reversal of 40138228 is 82283104.

It can be written as a sum of positive squares in 2 ways, for example, as 12027024 + 28111204 = 3468^2 + 5302^2 .

It is a super-2 number, since 2×40138228² = 3222154693959968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40138196 and 40138205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385893 + ... + 385996.

Almost surely, 2^40138228 is an apocalyptic number.

It is an amenable number.

40138228 is a deficient number, since it is larger than the sum of its proper divisors (35506992).

40138228 is a wasteful number, since it uses less digits than its factorization.

40138228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771906 (or 771904 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 40138228 is about 6335.4737786530. The cubic root of 40138228 is about 342.3886806787.

The spelling of 40138228 in words is "forty million, one hundred thirty-eight thousand, two hundred twenty-eight".