387720231 has 16 divisors (see below), whose sum is σ = 532290528. Its totient is φ = 250880000.

The previous prime is 387720217. The next prime is 387720233. The reversal of 387720231 is 132027783.

It is a cyclic number.

It is not a de Polignac number, because 387720231 - 2⁵ = 387720199 is a prime.

It is a super-2 number, since 2×387720231² = 300653955053386722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 387720192 and 387720201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387720233) 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 15 ways as a sum of consecutive naturals, for example, 16231 + ... + 32231.

It is an arithmetic number, because the mean of its divisors is an integer number (33268158).

Almost surely, 2^387720231 is an apocalyptic number.

387720231 is a deficient number, since it is larger than the sum of its proper divisors (144570297).

387720231 is a wasteful number, since it uses less digits than its factorization.

387720231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16242.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 387720231 is about 19690.6127634464. The cubic root of 387720231 is about 729.1879573531.

The spelling of 387720231 in words is "three hundred eighty-seven million, seven hundred twenty thousand, two hundred thirty-one".