1228787145 has 32 divisors (see below), whose sum is σ = 2254986240. Its totient is φ = 634210560.

The previous prime is 1228787143. The next prime is 1228787227. The reversal of 1228787145 is 5417878221.

It is not a de Polignac number, because 1228787145 - 2¹ = 1228787143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1228787145.

It is not an unprimeable number, because it can be changed into a prime (1228787141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142624 + ... + 150993.

It is an arithmetic number, because the mean of its divisors is an integer number (70468320).

Almost surely, 2^1228787145 is an apocalyptic number.

1228787145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228787145 is a deficient number, since it is larger than the sum of its proper divisors (1026199095).

1228787145 is a wasteful number, since it uses less digits than its factorization.

1228787145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293662 (or 293656 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1228787145 is about 35054.0603211668. The cubic root of 1228787145 is about 1071.0889850661.

The spelling of 1228787145 in words is "one billion, two hundred twenty-eight million, seven hundred eighty-seven thousand, one hundred forty-five".