4006138867 has 4 divisors (see below), whose sum is σ = 4006323720. Its totient is φ = 4005954016.

The previous prime is 4006138853. The next prime is 4006138879. The reversal of 4006138867 is 7688316004.

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 4006138867 - 2⁷ = 4006138739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4006138667) 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, 54817 + ... + 104962.

It is an arithmetic number, because the mean of its divisors is an integer number (1001580930).

Almost surely, 2^4006138867 is an apocalyptic number.

4006138867 is a deficient number, since it is larger than the sum of its proper divisors (184853).

4006138867 is a wasteful number, since it uses less digits than its factorization.

4006138867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184852.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 4006138867 is about 63294.0666018546. The cubic root of 4006138867 is about 1588.2127072172.

The spelling of 4006138867 in words is "four billion, six million, one hundred thirty-eight thousand, eight hundred sixty-seven".