1227961857 has 16 divisors (see below), whose sum is σ = 1652971520. Its totient is φ = 810819072.

The previous prime is 1227961831. The next prime is 1227961871. The reversal of 1227961857 is 7581697221.

It is not a de Polignac number, because 1227961857 - 2⁸ = 1227961601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1227961157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254019 + ... + 258807.

It is an arithmetic number, because the mean of its divisors is an integer number (103310720).

Almost surely, 2^1227961857 is an apocalyptic number.

It is an amenable number.

1227961857 is a deficient number, since it is larger than the sum of its proper divisors (425009663).

1227961857 is a wasteful number, since it uses less digits than its factorization.

1227961857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592.

The product of its digits is 423360, while the sum is 48.

The square root of 1227961857 is about 35042.2866976457. The cubic root of 1227961857 is about 1070.8491402021.

The spelling of 1227961857 in words is "one billion, two hundred twenty-seven million, nine hundred sixty-one thousand, eight hundred fifty-seven".