381381 has 32 divisors (see below), whose sum is σ = 688128. Its totient is φ = 181440.

The previous prime is 381377. The next prime is 381383. The reversal of 381381 is 183183.

381381 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 381381 - 2² = 381377 is a prime.

It is a super-2 number, since 2×381381² = 290902934322, which contains 22 as substring.

It is an Ulam number.

381381 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2940 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (21504).

2³⁸¹³⁸¹ is an apocalyptic number.

It is an amenable number.

381381 is a deficient number, since it is larger than the sum of its proper divisors (306747).

381381 is a wasteful number, since it uses less digits than its factorization.

381381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

The product of its digits is 576, while the sum is 24.

The square root of 381381 is about 617.5605233497. The cubic root of 381381 is about 72.5192022066.

The spelling of 381381 in words is "three hundred eighty-one thousand, three hundred eighty-one".