8378961 has 4 divisors (see below), whose sum is σ = 11171952. Its totient is φ = 5585972.

The previous prime is 8378893. The next prime is 8378987. The reversal of 8378961 is 1698738.

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 8378961 - 2⁷ = 8378833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8378261) 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, 1396491 + ... + 1396496.

It is an arithmetic number, because the mean of its divisors is an integer number (2792988).

Almost surely, 2^8378961 is an apocalyptic number.

It is an amenable number.

8378961 is a deficient number, since it is larger than the sum of its proper divisors (2792991).

8378961 is a wasteful number, since it uses less digits than its factorization.

8378961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792990.

The product of its digits is 72576, while the sum is 42.

The square root of 8378961 is about 2894.6435013659. The cubic root of 8378961 is about 203.1094154828.

It can be divided in two parts, 8378 and 961, that added together give a palindrome (9339).

The spelling of 8378961 in words is "eight million, three hundred seventy-eight thousand, nine hundred sixty-one".