1220240155 has 8 divisors (see below), whose sum is σ = 1500002784. Its totient is φ = 952382400.

The previous prime is 1220240143. The next prime is 1220240191. The reversal of 1220240155 is 5510420221.

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

It is not a de Polignac number, because 1220240155 - 2⁷ = 1220240027 is a prime.

It is a Duffinian number.

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, 2975991 + ... + 2976400.

It is an arithmetic number, because the mean of its divisors is an integer number (187500348).

Almost surely, 2^1220240155 is an apocalyptic number.

1220240155 is a deficient number, since it is larger than the sum of its proper divisors (279762629).

1220240155 is an equidigital number, since it uses as much as digits as its factorization.

1220240155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5952437.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1220240155 is about 34931.9360328053. The cubic root of 1220240155 is about 1068.5998383241.

Adding to 1220240155 its reverse (5510420221), we get a palindrome (6730660376).

The spelling of 1220240155 in words is "one billion, two hundred twenty million, two hundred forty thousand, one hundred fifty-five".