381120729 has 16 divisors (see below), whose sum is σ = 554710464. Its totient is φ = 230835200.

The previous prime is 381120713. The next prime is 381120737. The reversal of 381120729 is 927021183.

It is a cyclic number.

It is not a de Polignac number, because 381120729 - 2⁴ = 381120713 is a prime.

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 Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 381120729.

It is not an unprimeable number, because it can be changed into a prime (381120769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72469 + ... + 77549.

It is an arithmetic number, because the mean of its divisors is an integer number (34669404).

Almost surely, 2^381120729 is an apocalyptic number.

It is an amenable number.

381120729 is a deficient number, since it is larger than the sum of its proper divisors (173589735).

381120729 is a wasteful number, since it uses less digits than its factorization.

381120729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7368.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 381120729 is about 19522.3136180116. The cubic root of 381120729 is about 725.0270169877.

The spelling of 381120729 in words is "three hundred eighty-one million, one hundred twenty thousand, seven hundred twenty-nine".