389032381 has 4 divisors (see below), whose sum is σ = 389220700. Its totient is φ = 388844064.

The previous prime is 389032379. The next prime is 389032387. The reversal of 389032381 is 183230983.

389032381 = T₁₆₁₀₃ + T₁₆₁₀₄ + T₁₆₁₀₅.

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 233631225 + 155401156 = 15285^2 + 12466^2 .

It is a cyclic number.

It is not a de Polignac number, because 389032381 - 2¹ = 389032379 is a prime.

It is a super-2 number, since 2×389032381² = 302692386933058322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 389032381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389032387) 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, 91026 + ... + 95203.

It is an arithmetic number, because the mean of its divisors is an integer number (97305175).

Almost surely, 2^389032381 is an apocalyptic number.

389032381 is the 16105-th centered triangular number.

It is an amenable number.

389032381 is a deficient number, since it is larger than the sum of its proper divisors (188319).

389032381 is a wasteful number, since it uses less digits than its factorization.

389032381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188318.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 389032381 is about 19723.9037971696. The cubic root of 389032381 is about 730.0096208152.

The spelling of 389032381 in words is "three hundred eighty-nine million, thirty-two thousand, three hundred eighty-one".