1220791 has 8 divisors (see below), whose sum is σ = 1434384. Its totient is φ = 1024320.

The previous prime is 1220783. The next prime is 1220797. The reversal of 1220791 is 1970221.

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

It is not a de Polignac number, because 1220791 - 2³ = 1220783 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4126 + ... + 4411.

It is an arithmetic number, because the mean of its divisors is an integer number (179298).

2^1220791 is an apocalyptic number.

1220791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220791 is a deficient number, since it is larger than the sum of its proper divisors (213593).

1220791 is a wasteful number, since it uses less digits than its factorization.

1220791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1220791 is about 1104.8941125737. The cubic root of 1220791 is about 106.8760611137.

The spelling of 1220791 in words is "one million, two hundred twenty thousand, seven hundred ninety-one".