7138489 has 2 divisors, whose sum is σ = 7138490. Its totient is φ = 7138488.

The previous prime is 7138409. The next prime is 7138513. The reversal of 7138489 is 9848317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7112889 + 25600 = 2667^2 + 160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7138489 is a prime.

7138489 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7138409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569244 + 3569245.

It is an arithmetic number, because the mean of its divisors is an integer number (3569245).

Almost surely, 2^7138489 is an apocalyptic number.

It is an amenable number.

7138489 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138489 is an equidigital number, since it uses as much as digits as its factorization.

7138489 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 7138489 is about 2671.7950894483. The cubic root of 7138489 is about 192.5464126015.

The spelling of 7138489 in words is "seven million, one hundred thirty-eight thousand, four hundred eighty-nine".