1227195978 has 32 divisors (see below), whose sum is σ = 2585371200. Its totient is φ = 387265536.

The previous prime is 1227195953. The next prime is 1227195979. The reversal of 1227195978 is 8795917221.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1227195978.

It is not an unprimeable number, because it can be changed into a prime (1227195979) 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, 217578 + ... + 223146.

It is an arithmetic number, because the mean of its divisors is an integer number (80792850).

Almost surely, 2^1227195978 is an apocalyptic number.

1227195978 is an abundant number, since it is smaller than the sum of its proper divisors (1358175222).

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

1227195978 is a wasteful number, since it uses less digits than its factorization.

1227195978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526.

The product of its digits is 635040, while the sum is 51.

The square root of 1227195978 is about 35031.3570676330. The cubic root of 1227195978 is about 1070.6264646008.

The spelling of 1227195978 in words is "one billion, two hundred twenty-seven million, one hundred ninety-five thousand, nine hundred seventy-eight".