1289020 has 12 divisors (see below), whose sum is σ = 2706984. Its totient is φ = 515600.

The previous prime is 1289009. The next prime is 1289027. The reversal of 1289020 is 209821.

It is a junction number, because it is equal to n+sod(n) for n = 1288982 and 1289000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32206 + ... + 32245.

It is an arithmetic number, because the mean of its divisors is an integer number (225582).

2^1289020 is an apocalyptic number.

1289020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289020 is an abundant number, since it is smaller than the sum of its proper divisors (1417964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289020 is a wasteful number, since it uses less digits than its factorization.

1289020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64460 (or 64458 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1289020 is about 1135.3501662483. The cubic root of 1289020 is about 108.8311500700.

The spelling of 1289020 in words is "one million, two hundred eighty-nine thousand, twenty".