1272989 has 2 divisors, whose sum is σ = 1272990. Its totient is φ = 1272988.

The previous prime is 1272983. The next prime is 1272991. The reversal of 1272989 is 9892721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 444889 = 910^2 + 667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1272989 is a prime.

Together with 1272991, it forms a pair of twin primes.

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 (1272983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636494 + 636495.

It is an arithmetic number, because the mean of its divisors is an integer number (636495).

2^1272989 is an apocalyptic number.

It is an amenable number.

1272989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272989 is an equidigital number, since it uses as much as digits as its factorization.

1272989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 1272989 is about 1128.2681418883. The cubic root of 1272989 is about 108.3781043089.

The spelling of 1272989 in words is "one million, two hundred seventy-two thousand, nine hundred eighty-nine".