1228505540 has 24 divisors (see below), whose sum is σ = 2668823640. Its totient is φ = 474457088.

The previous prime is 1228505519. The next prime is 1228505563. The reversal of 1228505540 is 455058221.

It can be written as a sum of positive squares in 4 ways, for example, as 278756416 + 949749124 = 16696^2 + 30818^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1228505497 and 1228505506.

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, 1058477 + ... + 1059636.

It is an arithmetic number, because the mean of its divisors is an integer number (111200985).

Almost surely, 2^1228505540 is an apocalyptic number.

1228505540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1228505540 is an abundant number, since it is smaller than the sum of its proper divisors (1440318100).

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

1228505540 is a wasteful number, since it uses less digits than its factorization.

1228505540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118151 (or 2118149 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 1228505540 is about 35050.0433665923. The cubic root of 1228505540 is about 1071.0071572087.

The spelling of 1228505540 in words is "one billion, two hundred twenty-eight million, five hundred five thousand, five hundred forty".