386189381 has 4 divisors (see below), whose sum is σ = 387027564. Its totient is φ = 385351200.

The previous prime is 386189341. The next prime is 386189411. The reversal of 386189381 is 183981683.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 74666881 + 311522500 = 8641^2 + 17650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386189381 is a prime.

It is a super-2 number, since 2×386189381² = 298284475994326322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (386189311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418400 + ... + 419321.

It is an arithmetic number, because the mean of its divisors is an integer number (96756891).

Almost surely, 2^386189381 is an apocalyptic number.

It is an amenable number.

386189381 is a deficient number, since it is larger than the sum of its proper divisors (838183).

386189381 is an equidigital number, since it uses as much as digits as its factorization.

386189381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838182.

The product of its digits is 248832, while the sum is 47.

The square root of 386189381 is about 19651.7017329289. The cubic root of 386189381 is about 728.2269983312.

The spelling of 386189381 in words is "three hundred eighty-six million, one hundred eighty-nine thousand, three hundred eighty-one".