1226399999 has 16 divisors (see below), whose sum is σ = 1368976896. Its totient is φ = 1089096000.

The previous prime is 1226399981. The next prime is 1226400001. The reversal of 1226399999 is 9999936221.

It is a cyclic number.

It is not a de Polignac number, because 1226399999 - 2¹⁶ = 1226334463 is a prime.

1226399999 is a modest number, since divided by 99999 gives 12263 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226399939) 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, 308744 + ... + 312690.

It is an arithmetic number, because the mean of its divisors is an integer number (85561056).

Almost surely, 2^1226399999 is an apocalyptic number.

1226399999 is a deficient number, since it is larger than the sum of its proper divisors (142576897).

1226399999 is a wasteful number, since it uses less digits than its factorization.

1226399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606.

The product of its digits is 4251528, while the sum is 59.

The square root of 1226399999 is about 35019.9942746997. The cubic root of 1226399999 is about 1070.3949393693.

The spelling of 1226399999 in words is "one billion, two hundred twenty-six million, three hundred ninety-nine thousand, nine hundred ninety-nine".