381445 has 4 divisors (see below), whose sum is σ = 457740. Its totient is φ = 305152.

The previous prime is 381443. The next prime is 381461. The reversal of 381445 is 544183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74529 + 306916 = 273^2 + 554^2 .

It is a cyclic number.

It is not a de Polignac number, because 381445 - 2¹ = 381443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38140 + ... + 38149.

It is an arithmetic number, because the mean of its divisors is an integer number (114435).

2³⁸¹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

381445 is a deficient number, since it is larger than the sum of its proper divisors (76295).

381445 is an equidigital number, since it uses as much as digits as its factorization.

381445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76294.

The product of its digits is 1920, while the sum is 25.

The square root of 381445 is about 617.6123379597. The cubic root of 381445 is about 72.5232584910.

The spelling of 381445 in words is "three hundred eighty-one thousand, four hundred forty-five".