138066290 has 16 divisors (see below), whose sum is σ = 248673240. Its totient is φ = 55192320.

The previous prime is 138066251. The next prime is 138066301. The reversal of 138066290 is 92660831.

138066290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 71757841 + 66308449 = 8471^2 + 8143^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138066290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18416 + ... + 24804.

Almost surely, 2^138066290 is an apocalyptic number.

138066290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138066290 is a deficient number, since it is larger than the sum of its proper divisors (110606950).

138066290 is a wasteful number, since it uses less digits than its factorization.

138066290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8557.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138066290 is about 11750.1612754889. The cubic root of 138066290 is about 516.8476567900.

The spelling of 138066290 in words is "one hundred thirty-eight million, sixty-six thousand, two hundred ninety".