381489765 has 16 divisors (see below), whose sum is σ = 624579648. Its totient is φ = 198729216.

The previous prime is 381489761. The next prime is 381489767. The reversal of 381489765 is 567984183.

It is not a de Polignac number, because 381489765 - 2² = 381489761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381489761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295084 + ... + 296373.

It is an arithmetic number, because the mean of its divisors is an integer number (39036228).

Almost surely, 2^381489765 is an apocalyptic number.

It is an amenable number.

381489765 is a deficient number, since it is larger than the sum of its proper divisors (243089883).

381489765 is a wasteful number, since it uses less digits than its factorization.

381489765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591508.

The product of its digits is 1451520, while the sum is 51.

The square root of 381489765 is about 19531.7629772635. The cubic root of 381489765 is about 725.2609540206.

The spelling of 381489765 in words is "three hundred eighty-one million, four hundred eighty-nine thousand, seven hundred sixty-five".