1280990 has 8 divisors (see below), whose sum is σ = 2305800. Its totient is φ = 512392.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1280990 is 990821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64040 + ... + 64059.

It is an arithmetic number, because the mean of its divisors is an integer number (288225).

2^1280990 is an apocalyptic number.

1280990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1280990 is a deficient number, since it is larger than the sum of its proper divisors (1024810).

1280990 is a wasteful number, since it uses less digits than its factorization.

1280990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128106.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1280990 is about 1131.8082876530. The cubic root of 1280990 is about 108.6046898818.

The spelling of 1280990 in words is "one million, two hundred eighty thousand, nine hundred ninety".