378665 has 16 divisors (see below), whose sum is σ = 537600. Its totient is φ = 250560.

The previous prime is 378661. The next prime is 378667. The reversal of 378665 is 566873.

It is a happy number.

It is not a de Polignac number, because 378665 - 2² = 378661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (33600).

2³⁷⁸⁶⁶⁵ is an apocalyptic number.

378665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

378665 is a deficient number, since it is larger than the sum of its proper divisors (158935).

378665 is a wasteful number, since it uses less digits than its factorization.

378665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392.

The product of its digits is 30240, while the sum is 35.

The square root of 378665 is about 615.3576196002. The cubic root of 378665 is about 72.3466437359.

The spelling of 378665 in words is "three hundred seventy-eight thousand, six hundred sixty-five".