378121 has 4 divisors (see below), whose sum is σ = 381700. Its totient is φ = 374544.

The previous prime is 378101. The next prime is 378127. The reversal of 378121 is 121873.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 265225 = 336^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 378121 - 2⁵ = 378089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 378092 and 378101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378127) 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, 1626 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (95425).

2³⁷⁸¹²¹ is an apocalyptic number.

It is an amenable number.

378121 is a deficient number, since it is larger than the sum of its proper divisors (3579).

378121 is a wasteful number, since it uses less digits than its factorization.

378121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578.

The product of its digits is 336, while the sum is 22.

The square root of 378121 is about 614.9154413413. The cubic root of 378121 is about 72.3119821079.

Adding to 378121 its reverse (121873), we get a palindrome (499994).

It can be divided in two parts, 3781 and 21, that multiplied together give a triangular number (79401 = T₃₉₈).

The spelling of 378121 in words is "three hundred seventy-eight thousand, one hundred twenty-one".