7841389 has 4 divisors (see below), whose sum is σ = 7855740. Its totient is φ = 7827040.

The previous prime is 7841381. The next prime is 7841399. The reversal of 7841389 is 9831487.

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 2778889 + 5062500 = 1667^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 7841389 - 2³ = 7841381 is a prime.

It is a super-2 number, since 2×7841389² = 122974762898642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7841389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7841381) 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, 6322 + ... + 7459.

It is an arithmetic number, because the mean of its divisors is an integer number (1963935).

Almost surely, 2^7841389 is an apocalyptic number.

It is an amenable number.

7841389 is a deficient number, since it is larger than the sum of its proper divisors (14351).

7841389 is a wasteful number, since it uses less digits than its factorization.

7841389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14350.

The product of its digits is 48384, while the sum is 40.

The square root of 7841389 is about 2800.2480247292. The cubic root of 7841389 is about 198.6694089352.

The spelling of 7841389 in words is "seven million, eight hundred forty-one thousand, three hundred eighty-nine".