1380889 has 2 divisors, whose sum is σ = 1380890. Its totient is φ = 1380888.

The previous prime is 1380887. The next prime is 1380913. The reversal of 1380889 is 9880831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 585225 = 892^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380889 - 2¹ = 1380887 is a prime.

Together with 1380887, it forms a pair of twin primes.

It is a Chen prime.

1380889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1380881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690444 + 690445.

It is an arithmetic number, because the mean of its divisors is an integer number (690445).

2^1380889 is an apocalyptic number.

It is an amenable number.

1380889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380889 is an equidigital number, since it uses as much as digits as its factorization.

1380889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1380889 is about 1175.1123350557. The cubic root of 1380889 is about 111.3575301689.

The spelling of 1380889 in words is "one million, three hundred eighty thousand, eight hundred eighty-nine".