1390689 has 24 divisors (see below), whose sum is σ = 2140320. Its totient is φ = 902016.

The previous prime is 1390681. The next prime is 1390693. The reversal of 1390689 is 9860931.

It is not a de Polignac number, because 1390689 - 2³ = 1390681 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1390681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14289 + ... + 14385.

It is an arithmetic number, because the mean of its divisors is an integer number (89180).

2^1390689 is an apocalyptic number.

It is an amenable number.

1390689 is a deficient number, since it is larger than the sum of its proper divisors (749631).

1390689 is an frugal number, since it uses more digits than its factorization.

1390689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1390689 is about 1179.2747771406. The cubic root of 1390689 is about 111.6203396851.

The spelling of 1390689 in words is "one million, three hundred ninety thousand, six hundred eighty-nine".