381781923 has 8 divisors (see below), whose sum is σ = 511455936. Its totient is φ = 253314600.

The previous prime is 381781921. The next prime is 381781931. The reversal of 381781923 is 329187183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381781923 - 2¹ = 381781921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381781921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300933 + ... + 302198.

It is an arithmetic number, because the mean of its divisors is an integer number (63931992).

Almost surely, 2^381781923 is an apocalyptic number.

381781923 is a deficient number, since it is larger than the sum of its proper divisors (129674013).

381781923 is a wasteful number, since it uses less digits than its factorization.

381781923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603345.

The product of its digits is 72576, while the sum is 42.

The square root of 381781923 is about 19539.2405942503. The cubic root of 381781923 is about 725.4460500495.

The spelling of 381781923 in words is "three hundred eighty-one million, seven hundred eighty-one thousand, nine hundred twenty-three".