389279381 has 4 divisors (see below), whose sum is σ = 390060000. Its totient is φ = 388498764.

The previous prime is 389279357. The next prime is 389279389. The reversal of 389279381 is 183972983.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183972983 = 311 ⋅591553.

It is a cyclic number.

It is not a de Polignac number, because 389279381 - 2¹⁴ = 389262997 is a prime.

It is a super-2 number, since 2×389279381² = 303076872943486322, 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 (389279389) 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, 389561 + ... + 390558.

It is an arithmetic number, because the mean of its divisors is an integer number (97515000).

Almost surely, 2^389279381 is an apocalyptic number.

It is an amenable number.

389279381 is a deficient number, since it is larger than the sum of its proper divisors (780619).

389279381 is an equidigital number, since it uses as much as digits as its factorization.

389279381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780618.

The product of its digits is 653184, while the sum is 50.

The square root of 389279381 is about 19730.1642415870. The cubic root of 389279381 is about 730.1640845891.

The spelling of 389279381 in words is "three hundred eighty-nine million, two hundred seventy-nine thousand, three hundred eighty-one".