1220787 has 24 divisors (see below), whose sum is σ = 1909440. Its totient is φ = 748800.

The previous prime is 1220783. The next prime is 1220797. The reversal of 1220787 is 7870221.

It is not a de Polignac number, because 1220787 - 2² = 1220783 is a prime.

It is a super-3 number, since 3×1220787³ = 5458093139333950209, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220787.

It is not an unprimeable number, because it can be changed into a prime (1220783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12037 + ... + 12137.

It is an arithmetic number, because the mean of its divisors is an integer number (79560).

2^1220787 is an apocalyptic number.

1220787 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1220787 is a deficient number, since it is larger than the sum of its proper divisors (688653).

1220787 is a wasteful number, since it uses less digits than its factorization.

1220787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1220787 is about 1104.8923024440. The cubic root of 1220787 is about 106.8759443848.

The spelling of 1220787 in words is "one million, two hundred twenty thousand, seven hundred eighty-seven".