1281490 has 16 divisors (see below), whose sum is σ = 2636352. Its totient is φ = 439344.

The previous prime is 1281463. The next prime is 1281503. The reversal of 1281490 is 941821.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9084 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (164772).

2^1281490 is an apocalyptic number.

1281490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1281490 is an abundant number, since it is smaller than the sum of its proper divisors (1354862).

1281490 is a wasteful number, since it uses less digits than its factorization.

1281490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18321.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1281490 is about 1132.0291515681. The cubic root of 1281490 is about 108.6188183505.

It can be divided in two parts, 1281 and 490, that added together give a palindrome (1771).

The spelling of 1281490 in words is "one million, two hundred eighty-one thousand, four hundred ninety".