387891217 has 8 divisors (see below), whose sum is σ = 445406912. Its totient is φ = 330901200.

The previous prime is 387891169. The next prime is 387891223. The reversal of 387891217 is 712198783.

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

It is not a de Polignac number, because 387891217 - 2¹⁹ = 387366929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387891277) 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, 129834 + ... + 132787.

It is an arithmetic number, because the mean of its divisors is an integer number (55675864).

Almost surely, 2^387891217 is an apocalyptic number.

It is an amenable number.

387891217 is a deficient number, since it is larger than the sum of its proper divisors (57515695).

387891217 is a wasteful number, since it uses less digits than its factorization.

387891217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262839.

The product of its digits is 169344, while the sum is 46.

The square root of 387891217 is about 19694.9540999719. The cubic root of 387891217 is about 729.2951330934.

The spelling of 387891217 in words is "three hundred eighty-seven million, eight hundred ninety-one thousand, two hundred seventeen".