378445 has 4 divisors (see below), whose sum is σ = 454140. Its totient is φ = 302752.

The previous prime is 378439. The next prime is 378449. The reversal of 378445 is 544873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544873 = 7 ⋅77839.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 84681 = 542^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 378445 - 2⁷ = 378317 is a prime.

378445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378449) 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, 37840 + ... + 37849.

It is an arithmetic number, because the mean of its divisors is an integer number (113535).

2³⁷⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

378445 is a deficient number, since it is larger than the sum of its proper divisors (75695).

378445 is an equidigital number, since it uses as much as digits as its factorization.

378445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75694.

The product of its digits is 13440, while the sum is 31.

The square root of 378445 is about 615.1788357868. The cubic root of 378445 is about 72.3326301663.

The spelling of 378445 in words is "three hundred seventy-eight thousand, four hundred forty-five".