7918389 has 6 divisors (see below), whose sum is σ = 11437686. Its totient is φ = 5278920.

The previous prime is 7918387. The next prime is 7918397. The reversal of 7918389 is 9838197.

It can be written as a sum of positive squares in only one way, i.e., 4796100 + 3122289 = 2190^2 + 1767^2 .

It is not a de Polignac number, because 7918389 - 2¹ = 7918387 is a prime.

7918389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7918381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439902 + ... + 439919.

It is an arithmetic number, because the mean of its divisors is an integer number (1906281).

Almost surely, 2^7918389 is an apocalyptic number.

It is an amenable number.

7918389 is a deficient number, since it is larger than the sum of its proper divisors (3519297).

7918389 is a wasteful number, since it uses less digits than its factorization.

7918389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879827 (or 879824 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 7918389 is about 2813.9632193758. The cubic root of 7918389 is about 199.3175825135.

It can be divided in two parts, 791 and 8389, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 7918389 in words is "seven million, nine hundred eighteen thousand, three hundred eighty-nine".