389745778 has 4 divisors (see below), whose sum is σ = 584618670. Its totient is φ = 194872888.

The previous prime is 389745773. The next prime is 389745781. The reversal of 389745778 is 877547983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877547983 = 13 ⋅67503691.

It can be written as a sum of positive squares in only one way, i.e., 384669769 + 5076009 = 19613^2 + 2253^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (389745773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97436443 + ... + 97436446.

Almost surely, 2^389745778 is an apocalyptic number.

389745778 is a deficient number, since it is larger than the sum of its proper divisors (194872892).

389745778 is a wasteful number, since it uses less digits than its factorization.

389745778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194872891.

The product of its digits is 11854080, while the sum is 58.

The square root of 389745778 is about 19741.9800931923. The cubic root of 389745778 is about 730.4555722647.

The spelling of 389745778 in words is "three hundred eighty-nine million, seven hundred forty-five thousand, seven hundred seventy-eight".