1227726985905 has 192 divisors, whose sum is σ = 2588912202240. Its totient is φ = 525414408192.

The previous prime is 1227726985853. The next prime is 1227726985931. The reversal of 1227726985905 is 5095896277221.

1227726985905 is a `hidden beast` number, since 12 + 2 + 7 + 7 + 26 + 9 + 8 + 590 + 5 = 666.

It is not a de Polignac number, because 1227726985905 - 2¹³ = 1227726977713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1480973031 + ... + 1480973859.

It is an arithmetic number, because the mean of its divisors is an integer number (13483917720).

Almost surely, 2^{1227726985905} is an apocalyptic number.

1227726985905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1227726985905 is an abundant number, since it is smaller than the sum of its proper divisors (1361185216335).

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

1227726985905 is a wasteful number, since it uses less digits than its factorization.

1227726985905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 1227726985905 in words is "one trillion, two hundred twenty-seven billion, seven hundred twenty-six million, nine hundred eighty-five thousand, nine hundred five".