381261789 has 8 divisors (see below), whose sum is σ = 564832320. Its totient is φ = 254174508.

The previous prime is 381261787. The next prime is 381261799. The reversal of 381261789 is 987162183.

381261789 is a `hidden beast` number, since 381 + 261 + 7 + 8 + 9 = 666.

It is not a de Polignac number, because 381261789 - 2¹ = 381261787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381261781) 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 7 ways as a sum of consecutive naturals, for example, 7060377 + ... + 7060430.

It is an arithmetic number, because the mean of its divisors is an integer number (70604040).

Almost surely, 2^381261789 is an apocalyptic number.

It is an amenable number.

381261789 is a deficient number, since it is larger than the sum of its proper divisors (183570531).

381261789 is a wasteful number, since it uses less digits than its factorization.

381261789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14120816 (or 14120810 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 381261789 is about 19525.9260727885. The cubic root of 381261789 is about 725.1164546979.

The spelling of 381261789 in words is "three hundred eighty-one million, two hundred sixty-one thousand, seven hundred eighty-nine".