389056666 has 4 divisors (see below), whose sum is σ = 583585002. Its totient is φ = 194528332.

The previous prime is 389056651. The next prime is 389056687. The reversal of 389056666 is 666650983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666650983 = 13033 ⋅51151.

It can be written as a sum of positive squares in only one way, i.e., 346741641 + 42315025 = 18621^2 + 6505^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97264165 + ... + 97264168.

Almost surely, 2^389056666 is an apocalyptic number.

389056666 is a deficient number, since it is larger than the sum of its proper divisors (194528336).

389056666 is a wasteful number, since it uses less digits than its factorization.

389056666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194528335.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 389056666 is about 19724.5194111289. The cubic root of 389056666 is about 730.0248105660.

The spelling of 389056666 in words is "three hundred eighty-nine million, fifty-six thousand, six hundred sixty-six".