1389251 has 2 divisors, whose sum is σ = 1389252. Its totient is φ = 1389250.

The previous prime is 1389233. The next prime is 1389259. The reversal of 1389251 is 1529831.

It is a strong prime.

It is an emirp because it is prime and its reverse (1529831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1389251 - 2¹⁰ = 1388227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1389259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694625 + 694626.

It is an arithmetic number, because the mean of its divisors is an integer number (694626).

2^1389251 is an apocalyptic number.

1389251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389251 is an equidigital number, since it uses as much as digits as its factorization.

1389251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 1389251 is about 1178.6649226986. The cubic root of 1389251 is about 111.5818538688.

The spelling of 1389251 in words is "one million, three hundred eighty-nine thousand, two hundred fifty-one".