1289140 has 24 divisors (see below), whose sum is σ = 2772000. Its totient is φ = 503328.

The previous prime is 1289129. The next prime is 1289149. The reversal of 1289140 is 419821.

1289140 = T₃₄₉ + T₃₅₀ + ... + T₃₆₈.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289149) 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, 111 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (115500).

2^1289140 is an apocalyptic number.

1289140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386000).

1289140 is an abundant number, since it is smaller than the sum of its proper divisors (1482860).

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

1289140 is a wasteful number, since it uses less digits than its factorization.

1289140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1289140 is about 1135.4030121503. The cubic root of 1289140 is about 108.8345271402.

The spelling of 1289140 in words is "one million, two hundred eighty-nine thousand, one hundred forty".