381009 has 8 divisors (see below), whose sum is σ = 514080. Its totient is φ = 250976.

The previous prime is 381001. The next prime is 381011. The reversal of 381009 is 900183.

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 381009 - 2³ = 381001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381001) 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, 447 + ... + 980.

It is an arithmetic number, because the mean of its divisors is an integer number (64260).

2³⁸¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

381009 is a deficient number, since it is larger than the sum of its proper divisors (133071).

381009 is a wasteful number, since it uses less digits than its factorization.

381009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 381009 is about 617.2592648150. The cubic root of 381009 is about 72.4956160647.

The spelling of 381009 in words is "three hundred eighty-one thousand, nine".