7481389 has 2 divisors, whose sum is σ = 7481390. Its totient is φ = 7481388.

The previous prime is 7481387. The next prime is 7481401. The reversal of 7481389 is 9831847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7469289 + 12100 = 2733^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 7481389 - 2¹ = 7481387 is a prime.

Together with 7481387, it forms a pair of twin primes.

7481389 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7481381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3740694 + 3740695.

It is an arithmetic number, because the mean of its divisors is an integer number (3740695).

Almost surely, 2^7481389 is an apocalyptic number.

It is an amenable number.

7481389 is a deficient number, since it is larger than the sum of its proper divisors (1).

7481389 is an equidigital number, since it uses as much as digits as its factorization.

7481389 is an evil number, because the sum of its binary digits is even.

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

The square root of 7481389 is about 2735.2127887972. The cubic root of 7481389 is about 195.5813377226.

The spelling of 7481389 in words is "seven million, four hundred eighty-one thousand, three hundred eighty-nine".