1291842 has 32 divisors (see below), whose sum is σ = 2937600. Its totient is φ = 420624.

The previous prime is 1291831. The next prime is 1291861. The reversal of 1291842 is 2481921.

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2284 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (91800).

2^1291842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1468800).

1291842 is an abundant number, since it is smaller than the sum of its proper divisors (1645758).

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

1291842 is a wasteful number, since it uses less digits than its factorization.

1291842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

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

The square root of 1291842 is about 1136.5922751805. The cubic root of 1291842 is about 108.9105120801.

The spelling of 1291842 in words is "one million, two hundred ninety-one thousand, eight hundred forty-two".