387108891 has 12 divisors (see below), whose sum is σ = 602169568. Its totient is φ = 238220784.

The previous prime is 387108859. The next prime is 387108893. The reversal of 387108891 is 198801783.

It is not a de Polignac number, because 387108891 - 2⁵ = 387108859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387108893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1654195 + ... + 1654428.

Almost surely, 2^387108891 is an apocalyptic number.

387108891 is a deficient number, since it is larger than the sum of its proper divisors (215060677).

387108891 is a wasteful number, since it uses less digits than its factorization.

387108891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308642 (or 3308639 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 387108891 is about 19675.0829985543. The cubic root of 387108891 is about 728.8045053759.

It can be divided in two parts, 387 and 108891, that added together give a triangular number (109278 = T₄₆₇).

The spelling of 387108891 in words is "three hundred eighty-seven million, one hundred eight thousand, eight hundred ninety-one".