389666540 has 12 divisors (see below), whose sum is σ = 818299776. Its totient is φ = 155866608.

The previous prime is 389666539. The next prime is 389666561. The reversal of 389666540 is 45666983.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9741644 + ... + 9741683.

It is an arithmetic number, because the mean of its divisors is an integer number (68191648).

Almost surely, 2^389666540 is an apocalyptic number.

It is an amenable number.

389666540 is an abundant number, since it is smaller than the sum of its proper divisors (428633236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389666540 is a wasteful number, since it uses less digits than its factorization.

389666540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19483336 (or 19483334 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 389666540 is about 19739.9731509443. The cubic root of 389666540 is about 730.4060666939.

The spelling of 389666540 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, five hundred forty".