387138391 has 8 divisors (see below), whose sum is σ = 394579904. Its totient is φ = 379732320.

The previous prime is 387138383. The next prime is 387138397. The reversal of 387138391 is 193831783.

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

It is not a de Polignac number, because 387138391 - 2³ = 387138383 is a prime.

It is a super-2 number, since 2×387138391² = 299752267572137762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387138397) 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, 13741 + ... + 31033.

It is an arithmetic number, because the mean of its divisors is an integer number (49322488).

Almost surely, 2^387138391 is an apocalyptic number.

387138391 is a deficient number, since it is larger than the sum of its proper divisors (7441513).

387138391 is a wasteful number, since it uses less digits than its factorization.

387138391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17721.

The product of its digits is 108864, while the sum is 43.

The square root of 387138391 is about 19675.8326634478. The cubic root of 387138391 is about 728.8230179850.

The spelling of 387138391 in words is "three hundred eighty-seven million, one hundred thirty-eight thousand, three hundred ninety-one".