1291290 has 128 divisors (see below), whose sum is σ = 4257792. Its totient is φ = 241920.

The previous prime is 1291271. The next prime is 1291313. The reversal of 1291290 is 921921.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291290.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30009 + ... + 30051.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2^1291290 is an apocalyptic number.

1291290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2128896).

1291290 is an abundant number, since it is smaller than the sum of its proper divisors (2966502).

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

1291290 is a wasteful number, since it uses less digits than its factorization.

1291290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1291290 is about 1136.3494180929. The cubic root of 1291290 is about 108.8949974977.

The spelling of 1291290 in words is "one million, two hundred ninety-one thousand, two hundred ninety".