381780127 has 4 divisors (see below), whose sum is σ = 381883216. Its totient is φ = 381677040.

The previous prime is 381780103. The next prime is 381780143. The reversal of 381780127 is 721087183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381780127 is a prime.

It is a super-2 number, since 2×381780127² = 291512130744272258, 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 (381780527) 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 3 ways as a sum of consecutive naturals, for example, 45774 + ... + 53467.

It is an arithmetic number, because the mean of its divisors is an integer number (95470804).

Almost surely, 2^381780127 is an apocalyptic number.

381780127 is a deficient number, since it is larger than the sum of its proper divisors (103089).

381780127 is an equidigital number, since it uses as much as digits as its factorization.

381780127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103088.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 381780127 is about 19539.1946353989. The cubic root of 381780127 is about 725.4449124864. Note that the first 3 decimals are identical.

The spelling of 381780127 in words is "three hundred eighty-one million, seven hundred eighty thousand, one hundred twenty-seven".