1223915328 has 42 divisors (see below), whose sum is σ = 3508133954. Its totient is φ = 407971584.

The previous prime is 1223915311. The next prime is 1223915339. The reversal of 1223915328 is 8235193221.

1223915328 is a `hidden beast` number, since 12 + 23 + 91 + 532 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1156544064 + 67371264 = 34008^2 + 8208^2 .

It is a super-2 number, since 2×1223915328² = 2995937460226695168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1223915292 and 1223915301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1061851 + ... + 1063002.

Almost surely, 2^1223915328 is an apocalyptic number.

1223915328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1223915328 is an abundant number, since it is smaller than the sum of its proper divisors (2284218626).

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

1223915328 is a wasteful number, since it uses less digits than its factorization.

1223915328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124871 (or 2124858 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1223915328 is about 34984.5012541268. The cubic root of 1223915328 is about 1069.6715817421.

The spelling of 1223915328 in words is "one billion, two hundred twenty-three million, nine hundred fifteen thousand, three hundred twenty-eight".