381955 has 12 divisors (see below), whose sum is σ = 533520. Its totient is φ = 261744.

The previous prime is 381949. The next prime is 381977. The reversal of 381955 is 559183.

It is not a de Polignac number, because 381955 - 2⁹ = 381443 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 535 + ... + 1024.

It is an arithmetic number, because the mean of its divisors is an integer number (44460).

2³⁸¹⁹⁵⁵ is an apocalyptic number.

381955 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

381955 is a deficient number, since it is larger than the sum of its proper divisors (151565).

381955 is a wasteful number, since it uses less digits than its factorization.

381955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1571 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 381955 is about 618.0250803972. The cubic root of 381955 is about 72.5555658048. Note that the first 4 decimals are identical.

Subtracting from 381955 its sum of digits (31), we obtain a square (381924 = 618²).

The spelling of 381955 in words is "three hundred eighty-one thousand, nine hundred fifty-five".