1220440140 has 36 divisors (see below), whose sum is σ = 3702002304. Its totient is φ = 325450656.

The previous prime is 1220440139. The next prime is 1220440141. The reversal of 1220440140 is 410440221.

1220440140 is a `hidden beast` number, since 1 + 220 + 4 + 401 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (1220440139) and next prime (1220440141).

It is a tau number, because it is divible by the number of its divisors (36).

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

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 11 ways as a sum of consecutive naturals, for example, 3389932 + ... + 3390291.

Almost surely, 2^1220440140 is an apocalyptic number.

1220440140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220440140 is an abundant number, since it is smaller than the sum of its proper divisors (2481562164).

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

1220440140 is a wasteful number, since it uses less digits than its factorization.

1220440140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780238 (or 6780233 counting only the distinct ones).

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

The square root of 1220440140 is about 34934.7984107537. The cubic root of 1220440140 is about 1068.6582126980.

Adding to 1220440140 its reverse (410440221), we get a palindrome (1630880361).

The spelling of 1220440140 in words is "one billion, two hundred twenty million, four hundred forty thousand, one hundred forty".