387442189 has 8 divisors (see below), whose sum is σ = 410411448. Its totient is φ = 364492800.

The previous prime is 387442157. The next prime is 387442193. The reversal of 387442189 is 981244783.

It can be written as a sum of positive squares in 4 ways, for example, as 22250089 + 365192100 = 4717^2 + 19110^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 387442189 - 2⁵ = 387442157 is a prime.

It is a super-3 number, since 3×387442189³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387440189) 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, 58339 + ... + 64639.

It is an arithmetic number, because the mean of its divisors is an integer number (51301431).

Almost surely, 2^387442189 is an apocalyptic number.

It is an amenable number.

387442189 is a deficient number, since it is larger than the sum of its proper divisors (22969259).

387442189 is a wasteful number, since it uses less digits than its factorization.

387442189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9935.

The product of its digits is 387072, while the sum is 46.

The square root of 387442189 is about 19683.5512293895. The cubic root of 387442189 is about 729.0136105387.

The spelling of 387442189 in words is "three hundred eighty-seven million, four hundred forty-two thousand, one hundred eighty-nine".