1289142 has 16 divisors (see below), whose sum is σ = 2864880. Its totient is φ = 429696.

The previous prime is 1289129. The next prime is 1289149. The reversal of 1289142 is 2419821.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11883 + ... + 11990.

It is an arithmetic number, because the mean of its divisors is an integer number (179055).

2^1289142 is an apocalyptic number.

1289142 is an abundant number, since it is smaller than the sum of its proper divisors (1575738).

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

1289142 is a wasteful number, since it uses less digits than its factorization.

1289142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23884 (or 23878 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1289142 is about 1135.4038928945. The cubic root of 1289142 is about 108.8345834229.

It can be divided in two parts, 1289 and 142, that added together give a triangular number (1431 = T₅₃).

The spelling of 1289142 in words is "one million, two hundred eighty-nine thousand, one hundred forty-two".