1226206188 has 144 divisors (see below), whose sum is σ = 3409529760. Its totient is φ = 384652800.

The previous prime is 1226206169. The next prime is 1226206207. The reversal of 1226206188 is 8816026221.

1226206188 is a `hidden beast` number, since 1 + 22 + 620 + 6 + 1 + 8 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1226206169) and next prime (1226206207).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1155178 + ... + 1156238.

It is an arithmetic number, because the mean of its divisors is an integer number (23677290).

Almost surely, 2^1226206188 is an apocalyptic number.

1226206188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1226206188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1704764880).

1226206188 is an abundant number, since it is smaller than the sum of its proper divisors (2183323572).

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

1226206188 is a wasteful number, since it uses less digits than its factorization.

1226206188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1226206188 is about 35017.2270175695. The cubic root of 1226206188 is about 1070.3385506862.

The spelling of 1226206188 in words is "one billion, two hundred twenty-six million, two hundred six thousand, one hundred eighty-eight".