1227855890 has 16 divisors (see below), whose sum is σ = 2213144640. Its totient is φ = 490474800.

The previous prime is 1227855883. The next prime is 1227855901. The reversal of 1227855890 is 985587221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75686 + ... + 90465.

It is an arithmetic number, because the mean of its divisors is an integer number (138321540).

Almost surely, 2^1227855890 is an apocalyptic number.

1227855890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1227855890 is a deficient number, since it is larger than the sum of its proper divisors (985288750).

1227855890 is a wasteful number, since it uses less digits than its factorization.

1227855890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166897.

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 1227855890 is about 35040.7746775096. The cubic root of 1227855890 is about 1070.8183363314.

The spelling of 1227855890 in words is "one billion, two hundred twenty-seven million, eight hundred fifty-five thousand, eight hundred ninety".