387196991 has 8 divisors (see below), whose sum is σ = 407971200. Its totient is φ = 366462360.

The previous prime is 387196967. The next prime is 387196993. The reversal of 387196991 is 199691783.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387196991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387196993) 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, 11390 + ... + 30068.

It is an arithmetic number, because the mean of its divisors is an integer number (50996400).

Almost surely, 2^387196991 is an apocalyptic number.

387196991 is a deficient number, since it is larger than the sum of its proper divisors (20774209).

387196991 is a wasteful number, since it uses less digits than its factorization.

387196991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19789.

The product of its digits is 734832, while the sum is 53.

The square root of 387196991 is about 19677.3217435707. The cubic root of 387196991 is about 728.8597893956.

The spelling of 387196991 in words is "three hundred eighty-seven million, one hundred ninety-six thousand, nine hundred ninety-one".