1220440355 has 8 divisors (see below), whose sum is σ = 1470657600. Its totient is φ = 972266176.

The previous prime is 1220440349. The next prime is 1220440367. The reversal of 1220440355 is 5530440221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1220440355 - 2⁴ = 1220440339 is a prime.

It is a super-2 number, since 2×1220440355² = 2978949320225052050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509450 + ... + 511839.

It is an arithmetic number, because the mean of its divisors is an integer number (183832200).

Almost surely, 2^1220440355 is an apocalyptic number.

1220440355 is a deficient number, since it is larger than the sum of its proper divisors (250217245).

1220440355 is a wasteful number, since it uses less digits than its factorization.

1220440355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021533.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 1220440355 is about 34934.8014879146. The cubic root of 1220440355 is about 1068.6582754517.

Adding to 1220440355 its reverse (5530440221), we get a palindrome (6750880576).

The spelling of 1220440355 in words is "one billion, two hundred twenty million, four hundred forty thousand, three hundred fifty-five".