389620281 has 4 divisors (see below), whose sum is σ = 519493712. Its totient is φ = 259746852.

The previous prime is 389620261. The next prime is 389620333. The reversal of 389620281 is 182026983.

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.

It is not a de Polignac number, because 389620281 - 2¹¹ = 389618233 is a prime.

It is a super-2 number, since 2×389620281² = 303607926733037922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (389620261) 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, 64936711 + ... + 64936716.

It is an arithmetic number, because the mean of its divisors is an integer number (129873428).

Almost surely, 2^389620281 is an apocalyptic number.

It is an amenable number.

389620281 is a deficient number, since it is larger than the sum of its proper divisors (129873431).

389620281 is a wasteful number, since it uses less digits than its factorization.

389620281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129873430.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 389620281 is about 19738.8014073803. The cubic root of 389620281 is about 730.3771623292.

The spelling of 389620281 in words is "three hundred eighty-nine million, six hundred twenty thousand, two hundred eighty-one".