1226729390 has 16 divisors (see below), whose sum is σ = 2208854880. Its totient is φ = 490526880.

The previous prime is 1226729381. The next prime is 1226729393. The reversal of 1226729390 is 939276221.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226729393) 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 7 ways as a sum of consecutive naturals, for example, 13295 + ... + 51285.

It is an arithmetic number, because the mean of its divisors is an integer number (138053430).

Almost surely, 2^1226729390 is an apocalyptic number.

1226729390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1226729390 is a deficient number, since it is larger than the sum of its proper divisors (982125490).

1226729390 is a wasteful number, since it uses less digits than its factorization.

1226729390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41227.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1226729390 is about 35024.6968580743. The cubic root of 1226729390 is about 1070.4907609879.

The spelling of 1226729390 in words is "one billion, two hundred twenty-six million, seven hundred twenty-nine thousand, three hundred ninety".