1220120637 has 16 divisors (see below), whose sum is σ = 1637572800. Its totient is φ = 808060032.

The previous prime is 1220120609. The next prime is 1220120653. The reversal of 1220120637 is 7360210221.

It is not a de Polignac number, because 1220120637 - 2¹⁰ = 1220119613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295614 + ... + 299712.

It is an arithmetic number, because the mean of its divisors is an integer number (102348300).

Almost surely, 2^1220120637 is an apocalyptic number.

It is an amenable number.

1220120637 is a deficient number, since it is larger than the sum of its proper divisors (417452163).

1220120637 is a wasteful number, since it uses less digits than its factorization.

1220120637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1220120637 is about 34930.2252640890. The cubic root of 1220120637 is about 1068.5649487206.

Adding to 1220120637 its reverse (7360210221), we get a palindrome (8580330858).

The spelling of 1220120637 in words is "one billion, two hundred twenty million, one hundred twenty thousand, six hundred thirty-seven".