385216989 has 8 divisors (see below), whose sum is σ = 514500000. Its totient is φ = 256372656.

The previous prime is 385216939. The next prime is 385217023. The reversal of 385216989 is 989612583.

It is a happy number.

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

It is not a de Polignac number, because 385216989 - 2¹⁹ = 384692701 is a prime.

It is a super-2 number, since 2×385216989² = 296784257228452242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385216939) 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, 107614 + ... + 111135.

It is an arithmetic number, because the mean of its divisors is an integer number (64312500).

Almost surely, 2^385216989 is an apocalyptic number.

It is an amenable number.

385216989 is a deficient number, since it is larger than the sum of its proper divisors (129283011).

385216989 is a wasteful number, since it uses less digits than its factorization.

385216989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219339.

The product of its digits is 933120, while the sum is 51.

The square root of 385216989 is about 19626.9454831871. The cubic root of 385216989 is about 727.6152800867.

The spelling of 385216989 in words is "three hundred eighty-five million, two hundred sixteen thousand, nine hundred eighty-nine".