138843087 has 8 divisors (see below), whose sum is σ = 189429504. Its totient is φ = 90409368.

The previous prime is 138843083. The next prime is 138843113. The reversal of 138843087 is 780348831.

138843087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138843087 - 2² = 138843083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138843083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538023 + ... + 538280.

It is an arithmetic number, because the mean of its divisors is an integer number (23678688).

Almost surely, 2^138843087 is an apocalyptic number.

138843087 is a deficient number, since it is larger than the sum of its proper divisors (50586417).

138843087 is a wasteful number, since it uses less digits than its factorization.

138843087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076349.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 138843087 is about 11783.1696499711. The cubic root of 138843087 is about 517.8151512196.

The spelling of 138843087 in words is "one hundred thirty-eight million, eight hundred forty-three thousand, eighty-seven".