1220440401 has 12 divisors (see below), whose sum is σ = 1763224528. Its totient is φ = 813457944.

The previous prime is 1220440391. The next prime is 1220440423. The reversal of 1220440401 is 1040440221.

1220440401 is a `hidden beast` number, since 1 + 220 + 4 + 40 + 401 = 666.

It is not a de Polignac number, because 1220440401 - 2¹¹ = 1220438353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220440451) 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, 44466 + ... + 66468.

Almost surely, 2^1220440401 is an apocalyptic number.

It is an amenable number.

1220440401 is a deficient number, since it is larger than the sum of its proper divisors (542784127).

1220440401 is a wasteful number, since it uses less digits than its factorization.

1220440401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28172 (or 28169 counting only the distinct ones).

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

The square root of 1220440401 is about 34934.8021462839. The cubic root of 1220440401 is about 1068.6582888781.

Adding to 1220440401 its reverse (1040440221), we get a palindrome (2260880622).

The spelling of 1220440401 in words is "one billion, two hundred twenty million, four hundred forty thousand, four hundred one".