8378641 has 2 divisors, whose sum is σ = 8378642. Its totient is φ = 8378640.

The previous prime is 8378633. The next prime is 8378653. The reversal of 8378641 is 1468738.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8288641 + 90000 = 2879^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378641 - 2³ = 8378633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8378641.

It is not a weakly prime, because it can be changed into another prime (8378621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4189320 + 4189321.

It is an arithmetic number, because the mean of its divisors is an integer number (4189321).

Almost surely, 2^8378641 is an apocalyptic number.

It is an amenable number.

8378641 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378641 is an equidigital number, since it uses as much as digits as its factorization.

8378641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 8378641 is about 2894.5882263286. The cubic root of 8378641 is about 203.1068298066.

Subtracting from 8378641 its reverse (1468738), we obtain a triangular number (6909903 = T₃₇₁₇).

It can be divided in two parts, 837864 and 1, that added together give a triangular number (837865 = T₁₂₉₄).

The spelling of 8378641 in words is "eight million, three hundred seventy-eight thousand, six hundred forty-one".