4378121 has 4 divisors (see below), whose sum is σ = 4776144. Its totient is φ = 3980100.

The previous prime is 4378093. The next prime is 4378123. The reversal of 4378121 is 1218734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4378121 - 2⁶ = 4378057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4378123) 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, 198995 + ... + 199016.

It is an arithmetic number, because the mean of its divisors is an integer number (1194036).

Almost surely, 2^4378121 is an apocalyptic number.

It is an amenable number.

4378121 is a deficient number, since it is larger than the sum of its proper divisors (398023).

4378121 is a wasteful number, since it uses less digits than its factorization.

4378121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398022.

The product of its digits is 1344, while the sum is 26.

The square root of 4378121 is about 2092.3959950258. The cubic root of 4378121 is about 163.5921976859.

It can be divided in two parts, 437 and 8121, that added together give a palindrome (8558).

The spelling of 4378121 in words is "four million, three hundred seventy-eight thousand, one hundred twenty-one".