389340643 has 4 divisors (see below), whose sum is σ = 389430568. Its totient is φ = 389250720.

The previous prime is 389340629. The next prime is 389340671. The reversal of 389340643 is 346043983.

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

It is a cyclic number.

It is not a de Polignac number, because 389340643 - 2⁹ = 389340131 is a prime.

It is a super-2 number, since 2×389340643² = 303172272583306898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389340596 and 389340605.

It is not an unprimeable number, because it can be changed into a prime (389340143) 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, 38121 + ... + 47242.

It is an arithmetic number, because the mean of its divisors is an integer number (97357642).

Almost surely, 2^389340643 is an apocalyptic number.

389340643 is a deficient number, since it is larger than the sum of its proper divisors (89925).

389340643 is an equidigital number, since it uses as much as digits as its factorization.

389340643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89924.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 389340643 is about 19731.7166764577. The cubic root of 389340643 is about 730.2023852441.

It can be divided in two parts, 389340 and 643, that added together give a palindrome (389983).

The spelling of 389340643 in words is "three hundred eighty-nine million, three hundred forty thousand, six hundred forty-three".