1225779 has 8 divisors (see below), whose sum is σ = 1639680. Its totient is φ = 814536.

The previous prime is 1225769. The next prime is 1225787. The reversal of 1225779 is 9775221.

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

It is not a de Polignac number, because 1225779 - 2¹¹ = 1223731 is a prime.

It is a d-powerful number, because it can be written as 1 + 2⁸ + 2¹⁸ + 5⁶ + 7⁶ + 7⁷ + 9⁴ .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225729) 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, 1042 + ... + 1880.

It is an arithmetic number, because the mean of its divisors is an integer number (204960).

2^1225779 is an apocalyptic number.

1225779 is a deficient number, since it is larger than the sum of its proper divisors (413901).

1225779 is an equidigital number, since it uses as much as digits as its factorization.

1225779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329.

The product of its digits is 8820, while the sum is 33.

The square root of 1225779 is about 1107.1490414574. The cubic root of 1225779 is about 107.0214240735.

The spelling of 1225779 in words is "one million, two hundred twenty-five thousand, seven hundred seventy-nine".