387366381 has 10 divisors (see below), whose sum is σ = 578658542. Its totient is φ = 258244200.

The previous prime is 387366337. The next prime is 387366407. The reversal of 387366381 is 183663783.

387366381 is a `hidden beast` number, since 3 + 8 + 7 + 3 + 6 + 638 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 275726025 + 111640356 = 16605^2 + 10566^2 .

It is not a de Polignac number, because 387366381 - 2¹³ = 387358189 is a prime.

It is a super-2 number, since 2×387366381² = 300105426258074322, 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 (387366481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2391070 + ... + 2391231.

Almost surely, 2^387366381 is an apocalyptic number.

It is an amenable number.

387366381 is a deficient number, since it is larger than the sum of its proper divisors (191292161).

387366381 is an equidigital number, since it uses as much as digits as its factorization.

387366381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782313 (or 4782304 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 387366381 is about 19681.6254664090. The cubic root of 387366381 is about 728.9660605040.

The spelling of 387366381 in words is "three hundred eighty-seven million, three hundred sixty-six thousand, three hundred eighty-one".