381391645 has 8 divisors (see below), whose sum is σ = 457801056. Its totient is φ = 305025936.

The previous prime is 381391643. The next prime is 381391663. The reversal of 381391645 is 546193183.

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 381391645 - 2¹ = 381391643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381391598 and 381391607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381391643) 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 7 ways as a sum of consecutive naturals, for example, 13074 + ... + 30556.

It is an arithmetic number, because the mean of its divisors is an integer number (57225132).

Almost surely, 2^381391645 is an apocalyptic number.

It is an amenable number.

381391645 is a deficient number, since it is larger than the sum of its proper divisors (76409411).

381391645 is a wasteful number, since it uses less digits than its factorization.

381391645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21851.

The product of its digits is 77760, while the sum is 40.

The square root of 381391645 is about 19529.2510097034. The cubic root of 381391645 is about 725.1987691223.

The spelling of 381391645 in words is "three hundred eighty-one million, three hundred ninety-one thousand, six hundred forty-five".