387349891 has 8 divisors (see below), whose sum is σ = 397318064. Its totient is φ = 377425440.

The previous prime is 387349843. The next prime is 387349933. The reversal of 387349891 is 198943783.

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 387349891 - 2⁷ = 387349763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387341891) 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, 7405 + ... + 28801.

It is an arithmetic number, because the mean of its divisors is an integer number (49664758).

Almost surely, 2^387349891 is an apocalyptic number.

387349891 is a deficient number, since it is larger than the sum of its proper divisors (9968173).

387349891 is a wasteful number, since it uses less digits than its factorization.

387349891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21861.

The product of its digits is 1306368, while the sum is 52.

The square root of 387349891 is about 19681.2065432991. The cubic root of 387349891 is about 728.9557164460.

The spelling of 387349891 in words is "three hundred eighty-seven million, three hundred forty-nine thousand, eight hundred ninety-one".