4378861 has 4 divisors (see below), whose sum is σ = 4384732. Its totient is φ = 4372992.

The previous prime is 4378837. The next prime is 4378897. The reversal of 4378861 is 1688734.

It is a happy number.

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 2673225 + 1705636 = 1635^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 4378861 - 2¹⁹ = 3854573 is a prime.

It is a Duffinian number.

4378861 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4378861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (1096183).

Almost surely, 2^4378861 is an apocalyptic number.

It is an amenable number.

4378861 is a deficient number, since it is larger than the sum of its proper divisors (5871).

4378861 is an equidigital number, since it uses as much as digits as its factorization.

4378861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5870.

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

The square root of 4378861 is about 2092.5728183268. The cubic root of 4378861 is about 163.6014140755.

The spelling of 4378861 in words is "four million, three hundred seventy-eight thousand, eight hundred sixty-one".