138018019 has 6 divisors (see below), whose sum is σ = 146614604. Its totient is φ = 129899040.

The previous prime is 138018011. The next prime is 138018031. The reversal of 138018019 is 910810831.

It is not a de Polignac number, because 138018019 - 2³ = 138018011 is a prime.

It is a super-2 number, since 2×138018019² = 38097947137368722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138018011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 238497 + ... + 239074.

Almost surely, 2^138018019 is an apocalyptic number.

138018019 is a deficient number, since it is larger than the sum of its proper divisors (8596585).

138018019 is an equidigital number, since it uses as much as digits as its factorization.

138018019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477605 (or 477588 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 138018019 is about 11748.1070390085. The cubic root of 138018019 is about 516.7874160140.

The spelling of 138018019 in words is "one hundred thirty-eight million, eighteen thousand, nineteen".