1287290 has 16 divisors (see below), whose sum is σ = 2340360. Its totient is φ = 509760.

The previous prime is 1287289. The next prime is 1287323. The reversal of 1287290 is 927821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1270129 + 17161 = 1127^2 + 131^2 .

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, 500 + ... + 1680.

2^1287290 is an apocalyptic number.

1287290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287290 is a deficient number, since it is larger than the sum of its proper divisors (1053070).

1287290 is a wasteful number, since it uses less digits than its factorization.

1287290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1287290 is about 1134.5880309610. The cubic root of 1287290 is about 108.7824406675.

The spelling of 1287290 in words is "one million, two hundred eighty-seven thousand, two hundred ninety".