1247389 has 18 divisors (see below), whose sum is σ = 1509018. Its totient is φ = 1029600.

The previous prime is 1247383. The next prime is 1247401. The reversal of 1247389 is 9837421.

It can be written as a sum of positive squares in 3 ways, for example, as 108900 + 1138489 = 330^2 + 1067^2 .

It is not a de Polignac number, because 1247389 - 2¹³ = 1239197 is a prime.

1247389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247383) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20419 + ... + 20479.

2^1247389 is an apocalyptic number.

It is an amenable number.

1247389 is a deficient number, since it is larger than the sum of its proper divisors (261629).

1247389 is a wasteful number, since it uses less digits than its factorization.

1247389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 85 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 1247389 is about 1116.8657036547. The cubic root of 1247389 is about 107.6466791658.

The spelling of 1247389 in words is "one million, two hundred forty-seven thousand, three hundred eighty-nine".