7478389 has 2 divisors, whose sum is σ = 7478390. Its totient is φ = 7478388.

The previous prime is 7478371. The next prime is 7478407. The reversal of 7478389 is 9838747.

It is a balanced prime because it is at equal distance from previous prime (7478371) and next prime (7478407).

It can be written as a sum of positive squares in only one way, i.e., 5560164 + 1918225 = 2358^2 + 1385^2 .

It is an emirp because it is prime and its reverse (9838747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7478389 - 2⁵ = 7478357 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7478369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739194 + 3739195.

It is an arithmetic number, because the mean of its divisors is an integer number (3739195).

Almost surely, 2^7478389 is an apocalyptic number.

It is an amenable number.

7478389 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478389 is an equidigital number, since it uses as much as digits as its factorization.

7478389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 7478389 is about 2734.6643304069. The cubic root of 7478389 is about 195.5551918444. Note that the first 3 decimals are identical.

The spelling of 7478389 in words is "seven million, four hundred seventy-eight thousand, three hundred eighty-nine".