1220126257 has 8 divisors (see below), whose sum is σ = 1428440832. Its totient is φ = 1020314400.

The previous prime is 1220126239. The next prime is 1220126263. The reversal of 1220126257 is 7526210221.

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

It is not a de Polignac number, because 1220126257 - 2¹¹ = 1220124209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220126207) 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, 2125369 + ... + 2125942.

It is an arithmetic number, because the mean of its divisors is an integer number (178555104).

Almost surely, 2^1220126257 is an apocalyptic number.

It is an amenable number.

1220126257 is a deficient number, since it is larger than the sum of its proper divisors (208314575).

1220126257 is an equidigital number, since it uses as much as digits as its factorization.

1220126257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251359.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1220126257 is about 34930.3057100850. The cubic root of 1220126257 is about 1068.5665893578.

Adding to 1220126257 its reverse (7526210221), we get a palindrome (8746336478).

The spelling of 1220126257 in words is "one billion, two hundred twenty million, one hundred twenty-six thousand, two hundred fifty-seven".