1201689 has 8 divisors (see below), whose sum is σ = 1780320. Its totient is φ = 801108.

The previous prime is 1201687. The next prime is 1201691. The reversal of 1201689 is 9861021.

It is an interprime number because it is at equal distance from previous prime (1201687) and next prime (1201691).

It is not a de Polignac number, because 1201689 - 2¹ = 1201687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 44507 = 1201689 / (1 + 2 + 0 + 1 + 6 + 8 + 9).

It is not an unprimeable number, because it can be changed into a prime (1201687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22227 + ... + 22280.

It is an arithmetic number, because the mean of its divisors is an integer number (222540).

2^1201689 is an apocalyptic number.

It is an amenable number.

1201689 is a deficient number, since it is larger than the sum of its proper divisors (578631).

1201689 is an equidigital number, since it uses as much as digits as its factorization.

1201689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44516 (or 44510 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1201689 is about 1096.2157634335. The cubic root of 1201689 is about 106.3156899434.

The spelling of 1201689 in words is "one million, two hundred one thousand, six hundred eighty-nine".