1368989 has 2 divisors, whose sum is σ = 1368990. Its totient is φ = 1368988.

The previous prime is 1368979. The next prime is 1369009. The reversal of 1368989 is 9898631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902500 + 466489 = 950^2 + 683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368989 - 2¹⁶ = 1303453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1368979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684494 + 684495.

It is an arithmetic number, because the mean of its divisors is an integer number (684495).

2^1368989 is an apocalyptic number.

It is an amenable number.

1368989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368989 is an equidigital number, since it uses as much as digits as its factorization.

1368989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 1368989 is about 1170.0380335698. The cubic root of 1368989 is about 111.0367272886.

The spelling of 1368989 in words is "one million, three hundred sixty-eight thousand, nine hundred eighty-nine".