138004387 has 4 divisors (see below), whose sum is σ = 140266816. Its totient is φ = 135741960.

The previous prime is 138004381. The next prime is 138004397. The reversal of 138004387 is 783400831.

138004387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138004387 - 2⁷ = 138004259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138004381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131123 + ... + 1131244.

It is an arithmetic number, because the mean of its divisors is an integer number (35066704).

Almost surely, 2^138004387 is an apocalyptic number.

138004387 is a deficient number, since it is larger than the sum of its proper divisors (2262429).

138004387 is an equidigital number, since it uses as much as digits as its factorization.

138004387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262428.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 138004387 is about 11747.5268461068. The cubic root of 138004387 is about 516.7704011390.

The spelling of 138004387 in words is "one hundred thirty-eight million, four thousand, three hundred eighty-seven".