1281090 has 16 divisors (see below), whose sum is σ = 3074688. Its totient is φ = 341616.

The previous prime is 1281089. The next prime is 1281097. The reversal of 1281090 is 901821.

It is not an unprimeable number, because it can be changed into a prime (1281097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21322 + ... + 21381.

It is an arithmetic number, because the mean of its divisors is an integer number (192168).

2^1281090 is an apocalyptic number.

1281090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281090 is an abundant number, since it is smaller than the sum of its proper divisors (1793598).

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

1281090 is a wasteful number, since it uses less digits than its factorization.

1281090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42713.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1281090 is about 1131.8524638839. The cubic root of 1281090 is about 108.6075158696.

The spelling of 1281090 in words is "one million, two hundred eighty-one thousand, ninety".