1287830 has 16 divisors (see below), whose sum is σ = 2345760. Its totient is φ = 508992.

The previous prime is 1287829. The next prime is 1287841. The reversal of 1287830 is 387821.

It is a super-2 number, since 2×1287830² = 3317012217800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1287793 and 1287802.

It is a congruent 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, 167 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (146610).

2^1287830 is an apocalyptic number.

1287830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287830 is a deficient number, since it is larger than the sum of its proper divisors (1057930).

1287830 is a wasteful number, since it uses less digits than its factorization.

1287830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1287830 is about 1134.8259778486. The cubic root of 1287830 is about 108.7976494410.

Subtracting from 1287830 its reverse (387821), we obtain a palindrome (900009).

The spelling of 1287830 in words is "one million, two hundred eighty-seven thousand, eight hundred thirty".