1220040144 has 100 divisors (see below), whose sum is σ = 3581154720. Its totient is φ = 400921920.

The previous prime is 1220040131. The next prime is 1220040149. The reversal of 1220040144 is 4410400221.

1220040144 is a `hidden beast` number, since 1 + 220 + 0 + 401 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220040149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 85387 + ... + 98645.

Almost surely, 2^1220040144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220040144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790577360).

1220040144 is an abundant number, since it is smaller than the sum of its proper divisors (2361114576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220040144 is a wasteful number, since it uses less digits than its factorization.

1220040144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13350 (or 13335 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1220040144 is about 34929.0730481071. The cubic root of 1220040144 is about 1068.5414499814.

Adding to 1220040144 its reverse (4410400221), we get a palindrome (5630440365).

The spelling of 1220040144 in words is "one billion, two hundred twenty million, forty thousand, one hundred forty-four".