378817 has 2 divisors, whose sum is σ = 378818. Its totient is φ = 378816.

The previous prime is 378809. The next prime is 378821. The reversal of 378817 is 718873.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231361 + 147456 = 481^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 378817 - 2³ = 378809 is a prime.

It is not a weakly prime, because it can be changed into another prime (378317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189408 + 189409.

It is an arithmetic number, because the mean of its divisors is an integer number (189409).

2³⁷⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

378817 is a deficient number, since it is larger than the sum of its proper divisors (1).

378817 is an equidigital number, since it uses as much as digits as its factorization.

378817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 34.

The square root of 378817 is about 615.4811126265. The cubic root of 378817 is about 72.3563226683.

The spelling of 378817 in words is "three hundred seventy-eight thousand, eight hundred seventeen".