4378689 has 18 divisors (see below), whose sum is σ = 7358130. Its totient is φ = 2501856.

The previous prime is 4378631. The next prime is 4378697. The reversal of 4378689 is 9868734.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3186225 + 1192464 = 1785^2 + 1092^2 .

It is not a de Polignac number, because 4378689 - 2¹³ = 4370497 is a prime.

It is a Curzon number.

4378689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4378609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4524 + ... + 5405.

It is an arithmetic number, because the mean of its divisors is an integer number (408785).

Almost surely, 2^4378689 is an apocalyptic number.

4378689 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

4378689 is a deficient number, since it is larger than the sum of its proper divisors (2979441).

4378689 is a wasteful number, since it uses less digits than its factorization.

4378689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9949 (or 9939 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 4378689 is about 2092.5317201897. The cubic root of 4378689 is about 163.5992719802.

Adding to 4378689 its sum of digits (45), we get a palindrome (4378734).

The spelling of 4378689 in words is "four million, three hundred seventy-eight thousand, six hundred eighty-nine".