378643 has 4 divisors (see below), whose sum is σ = 384048. Its totient is φ = 373240.

The previous prime is 378629. The next prime is 378661. The reversal of 378643 is 346873.

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

It is a cyclic number.

It is not a de Polignac number, because 378643 - 2¹³ = 370451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378683) 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, 2596 + ... + 2737.

It is an arithmetic number, because the mean of its divisors is an integer number (96012).

2³⁷⁸⁶⁴³ is an apocalyptic number.

378643 is a deficient number, since it is larger than the sum of its proper divisors (5405).

378643 is an equidigital number, since it uses as much as digits as its factorization.

378643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5404.

The product of its digits is 12096, while the sum is 31.

The square root of 378643 is about 615.3397435564. The cubic root of 378643 is about 72.3452426232.

The spelling of 378643 in words is "three hundred seventy-eight thousand, six hundred forty-three".