1228440155 has 16 divisors (see below), whose sum is σ = 1589565600. Its totient is φ = 908317440.

The previous prime is 1228440127. The next prime is 1228440173. The reversal of 1228440155 is 5510448221.

It is not a de Polignac number, because 1228440155 - 2¹² = 1228436059 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153800 + ... + 161589.

It is an arithmetic number, because the mean of its divisors is an integer number (99347850).

Almost surely, 2^1228440155 is an apocalyptic number.

1228440155 is a deficient number, since it is larger than the sum of its proper divisors (361125445).

1228440155 is a wasteful number, since it uses less digits than its factorization.

1228440155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315454.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 1228440155 is about 35049.1106163908. The cubic root of 1228440155 is about 1070.9881560611.

Adding to 1228440155 its reverse (5510448221), we get a palindrome (6738888376).

The spelling of 1228440155 in words is "one billion, two hundred twenty-eight million, four hundred forty thousand, one hundred fifty-five".