1226156120 has 64 divisors (see below), whose sum is σ = 3204705600. Its totient is φ = 413498880.

The previous prime is 1226156119. The next prime is 1226156123. The reversal of 1226156120 is 216516221.

It is a super-2 number, since 2×1226156120² = 3006917661226908800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1226156120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226156123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18815 + ... + 52974.

It is an arithmetic number, because the mean of its divisors is an integer number (50073525).

Almost surely, 2^1226156120 is an apocalyptic number.

1226156120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226156120 is an abundant number, since it is smaller than the sum of its proper divisors (1978549480).

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

1226156120 is a wasteful number, since it uses less digits than its factorization.

1226156120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71868 (or 71864 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1226156120 is about 35016.5121050055. The cubic root of 1226156120 is about 1070.3239825980.

The spelling of 1226156120 in words is "one billion, two hundred twenty-six million, one hundred fifty-six thousand, one hundred twenty".