1206989 has 4 divisors (see below), whose sum is σ = 1379424. Its totient is φ = 1034556.

The previous prime is 1206979. The next prime is 1207001. The reversal of 1206989 is 9896021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9896021 = 863 ⋅11467.

It is a cyclic number.

It is not a de Polignac number, because 1206989 - 2⁴ = 1206973 is a prime.

It is a super-2 number, since 2×1206989² = 2913644892242, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86207 + ... + 86220.

It is an arithmetic number, because the mean of its divisors is an integer number (344856).

2^1206989 is an apocalyptic number.

It is an amenable number.

1206989 is a deficient number, since it is larger than the sum of its proper divisors (172435).

1206989 is an equidigital number, since it uses as much as digits as its factorization.

1206989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172434.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1206989 is about 1098.6305111365. The cubic root of 1206989 is about 106.4717610480.

The spelling of 1206989 in words is "one million, two hundred six thousand, nine hundred eighty-nine".