389906779 has 8 divisors (see below), whose sum is σ = 392257008. Its totient is φ = 387563520.

The previous prime is 389906753. The next prime is 389906789. The reversal of 389906779 is 977609983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389906779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389906749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145419 + ... + 148075.

It is an arithmetic number, because the mean of its divisors is an integer number (49032126).

Almost surely, 2^389906779 is an apocalyptic number.

389906779 is a deficient number, since it is larger than the sum of its proper divisors (2350229).

389906779 is a wasteful number, since it uses less digits than its factorization.

389906779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The square root of 389906779 is about 19746.0573026617. The cubic root of 389906779 is about 730.5561402880.

The spelling of 389906779 in words is "three hundred eighty-nine million, nine hundred six thousand, seven hundred seventy-nine".