1220440145 has 8 divisors (see below), whose sum is σ = 1528203456. Its totient is φ = 933901936.

The previous prime is 1220440141. The next prime is 1220440159. The reversal of 1220440145 is 5410440221.

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

It is not a de Polignac number, because 1220440145 - 2² = 1220440141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220440145.

It is not an unprimeable number, because it can be changed into a prime (1220440141) 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, 5306147 + ... + 5306376.

It is an arithmetic number, because the mean of its divisors is an integer number (191025432).

Almost surely, 2^1220440145 is an apocalyptic number.

It is an amenable number.

1220440145 is a deficient number, since it is larger than the sum of its proper divisors (307763311).

1220440145 is a wasteful number, since it uses less digits than its factorization.

1220440145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10612551.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1220440145 is about 34934.7984823156. The cubic root of 1220440145 is about 1068.6582141574.

Adding to 1220440145 its reverse (5410440221), we get a palindrome (6630880366).

The spelling of 1220440145 in words is "one billion, two hundred twenty million, four hundred forty thousand, one hundred forty-five".