7400389 has 4 divisors (see below), whose sum is σ = 7835724. Its totient is φ = 6965056.

The previous prime is 7400381. The next prime is 7400399. The reversal of 7400389 is 9830047.

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 3771364 + 3629025 = 1942^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 7400389 - 2³ = 7400381 is a prime.

It is a Smith number, since the sum of its digits (31) 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.

7400389 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7400389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7400381) 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 3 ways as a sum of consecutive naturals, for example, 217642 + ... + 217675.

It is an arithmetic number, because the mean of its divisors is an integer number (1958931).

Almost surely, 2^7400389 is an apocalyptic number.

It is an amenable number.

7400389 is a deficient number, since it is larger than the sum of its proper divisors (435335).

7400389 is a wasteful number, since it uses less digits than its factorization.

7400389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435334.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 7400389 is about 2720.3656004295. The cubic root of 7400389 is about 194.8729305831.

It can be divided in two parts, 740038 and 9, that added together give a palindrome (740047).

The spelling of 7400389 in words is "seven million, four hundred thousand, three hundred eighty-nine".