138028218 has 32 divisors (see below), whose sum is σ = 282206592. Its totient is φ = 44990400.

The previous prime is 138028207. The next prime is 138028229. The reversal of 138028218 is 812820831.

It is an interprime number because it is at equal distance from previous prime (138028207) and next prime (138028229).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133363 + ... + 134393.

It is an arithmetic number, because the mean of its divisors is an integer number (8818956).

Almost surely, 2^138028218 is an apocalyptic number.

138028218 is an abundant number, since it is smaller than the sum of its proper divisors (144178374).

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

138028218 is a wasteful number, since it uses less digits than its factorization.

138028218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 138028218 is about 11748.5411009197. The cubic root of 138028218 is about 516.8001452336.

The spelling of 138028218 in words is "one hundred thirty-eight million, twenty-eight thousand, two hundred eighteen".