387081381 has 32 divisors (see below), whose sum is σ = 558472320. Its totient is φ = 237602816.

The previous prime is 387081377. The next prime is 387081391. The reversal of 387081381 is 183180783.

It is a cyclic number.

It is not a de Polignac number, because 387081381 - 2² = 387081377 is a prime.

It is a super-2 number, since 2×387081381² = 299663991033734322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387081361) 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 31 ways as a sum of consecutive naturals, for example, 485275 + ... + 486071.

It is an arithmetic number, because the mean of its divisors is an integer number (17452260).

Almost surely, 2^387081381 is an apocalyptic number.

It is an amenable number.

387081381 is a deficient number, since it is larger than the sum of its proper divisors (171390939).

387081381 is a wasteful number, since it uses less digits than its factorization.

387081381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 387081381 is about 19674.3838785361. The cubic root of 387081381 is about 728.7872407359.

The spelling of 387081381 in words is "three hundred eighty-seven million, eighty-one thousand, three hundred eighty-one".