1392889 has 2 divisors, whose sum is σ = 1392890. Its totient is φ = 1392888.

The previous prime is 1392883. The next prime is 1392901. The reversal of 1392889 is 9882931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 627264 = 875^2 + 792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1392889 - 2¹¹ = 1390841 is a prime.

1392889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1392883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696444 + 696445.

It is an arithmetic number, because the mean of its divisors is an integer number (696445).

2^1392889 is an apocalyptic number.

It is an amenable number.

1392889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392889 is an equidigital number, since it uses as much as digits as its factorization.

1392889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 1392889 is about 1180.2071852010. The cubic root of 1392889 is about 111.6791679279.

The spelling of 1392889 in words is "one million, three hundred ninety-two thousand, eight hundred eighty-nine".