1227997857 has 8 divisors (see below), whose sum is σ = 1665082080. Its totient is φ = 804789440.

The previous prime is 1227997843. The next prime is 1227997861. The reversal of 1227997857 is 7587997221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1227997857 - 2¹¹ = 1227995809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1227997797 and 1227997806.

It is not an unprimeable number, because it can be changed into a prime (1227997877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3468744 + ... + 3469097.

It is an arithmetic number, because the mean of its divisors is an integer number (208135260).

Almost surely, 2^1227997857 is an apocalyptic number.

It is an amenable number.

1227997857 is a deficient number, since it is larger than the sum of its proper divisors (437084223).

1227997857 is an equidigital number, since it uses as much as digits as its factorization.

1227997857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6937903.

The product of its digits is 4445280, while the sum is 57.

The square root of 1227997857 is about 35042.8003589896. The cubic root of 1227997857 is about 1070.8596047488.

The spelling of 1227997857 in words is "one billion, two hundred twenty-seven million, nine hundred ninety-seven thousand, eight hundred fifty-seven".