1226395188 has 48 divisors (see below), whose sum is σ = 3208744000. Its totient is φ = 405044064.

The previous prime is 1226395187. The next prime is 1226395231. The reversal of 1226395188 is 8815936221.

1226395188 is a `hidden beast` number, since 1 + 2 + 2 + 639 + 5 + 1 + 8 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226395187) by changing a digit.

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, 40318 + ... + 63861.

Almost surely, 2^1226395188 is an apocalyptic number.

1226395188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1226395188 is an abundant number, since it is smaller than the sum of its proper divisors (1982348812).

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

1226395188 is a wasteful number, since it uses less digits than its factorization.

1226395188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104301 (or 104293 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1226395188 is about 35019.9255853007. The cubic root of 1226395188 is about 1070.3935396964.

The spelling of 1226395188 in words is "one billion, two hundred twenty-six million, three hundred ninety-five thousand, one hundred eighty-eight".