1291992 has 64 divisors (see below), whose sum is σ = 3598560. Its totient is φ = 384000.

The previous prime is 1291991. The next prime is 1291999. The reversal of 1291992 is 2991921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12742 + ... + 12842.

2^1291992 is an apocalyptic number.

1291992 is a gapful number since it is divisible by the number (12) 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 1291992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799280).

1291992 is an abundant number, since it is smaller than the sum of its proper divisors (2306568).

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

1291992 is a wasteful number, since it uses less digits than its factorization.

1291992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 160 counting only the distinct ones).

The product of its digits is 2916, while the sum is 33.

The square root of 1291992 is about 1136.6582599885. The cubic root of 1291992 is about 108.9147272356.

The spelling of 1291992 in words is "one million, two hundred ninety-one thousand, nine hundred ninety-two".