386138971 has 4 divisors (see below), whose sum is σ = 386402944. Its totient is φ = 385875000.

The previous prime is 386138953. The next prime is 386138983. The reversal of 386138971 is 179831683.

386138971 = T₁₆₀₄₃ + T₁₆₀₄₄ + T₁₆₀₄₅.

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

It is a 6-Lehmer number, since φ(386138971) divides (386138971-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 386138971 - 2⁵ = 386138939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386138911) 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, 129780 + ... + 132721.

It is an arithmetic number, because the mean of its divisors is an integer number (96600736).

Almost surely, 2^386138971 is an apocalyptic number.

386138971 is the 16045-th centered triangular number.

386138971 is a deficient number, since it is larger than the sum of its proper divisors (263973).

386138971 is a wasteful number, since it uses less digits than its factorization.

386138971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263972.

The product of its digits is 217728, while the sum is 46.

The square root of 386138971 is about 19650.4191049453. The cubic root of 386138971 is about 728.1953113556.

The spelling of 386138971 in words is "three hundred eighty-six million, one hundred thirty-eight thousand, nine hundred seventy-one".