1289992 has 32 divisors (see below), whose sum is σ = 2682720. Its totient is φ = 576640.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1289992 is 2999821.

It is an interprime number because it is at equal distance from previous prime (1289971) and next prime (1290013).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9348 + ... + 9484.

It is an arithmetic number, because the mean of its divisors is an integer number (83835).

2^1289992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341360).

1289992 is an abundant number, since it is smaller than the sum of its proper divisors (1392728).

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

1289992 is a wasteful number, since it uses less digits than its factorization.

1289992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 257 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 1289992 is about 1135.7781473510. The cubic root of 1289992 is about 108.8584983139.

The spelling of 1289992 in words is "one million, two hundred eighty-nine thousand, nine hundred ninety-two".