381187729 has 8 divisors (see below), whose sum is σ = 412074432. Its totient is φ = 350524560.

The previous prime is 381187693. The next prime is 381187739. The reversal of 381187729 is 927781183.

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 381187729 - 2¹³ = 381179537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381187739) 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, 52327 + ... + 59164.

It is an arithmetic number, because the mean of its divisors is an integer number (51509304).

Almost surely, 2^381187729 is an apocalyptic number.

It is an amenable number.

381187729 is a deficient number, since it is larger than the sum of its proper divisors (30886703).

381187729 is a wasteful number, since it uses less digits than its factorization.

381187729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111767.

The product of its digits is 169344, while the sum is 46.

The square root of 381187729 is about 19524.0295277384. The cubic root of 381187729 is about 725.0695004320.

The spelling of 381187729 in words is "three hundred eighty-one million, one hundred eighty-seven thousand, seven hundred twenty-nine".