378881 has 4 divisors (see below), whose sum is σ = 388164. Its totient is φ = 369600.

The previous prime is 378869. The next prime is 378883. The reversal of 378881 is 188873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188873 = 67 ⋅2819.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 167281 = 460^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 378881 - 2⁶ = 378817 is a prime.

It is a super-2 number, since 2×378881² = 287101624322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378883) 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, 4580 + ... + 4661.

It is an arithmetic number, because the mean of its divisors is an integer number (97041).

It is a Proth number, since it is equal to 185 ⋅ 2¹¹ + 1 and 185 < 2¹¹.

2³⁷⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

378881 is a deficient number, since it is larger than the sum of its proper divisors (9283).

378881 is an equidigital number, since it uses as much as digits as its factorization.

378881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282.

The product of its digits is 10752, while the sum is 35.

The square root of 378881 is about 615.5331022780. The cubic root of 378881 is about 72.3603972336.

The spelling of 378881 in words is "three hundred seventy-eight thousand, eight hundred eighty-one".