1218922977 has 16 divisors (see below), whose sum is σ = 1659405888. Its totient is φ = 795701760.

The previous prime is 1218922963. The next prime is 1218922981. The reversal of 1218922977 is 7792298121.

It is a happy number.

It is not a de Polignac number, because 1218922977 - 2¹¹ = 1218920929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218922937) 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, 6477 + ... + 49797.

It is an arithmetic number, because the mean of its divisors is an integer number (103712868).

Almost surely, 2^1218922977 is an apocalyptic number.

It is an amenable number.

1218922977 is a deficient number, since it is larger than the sum of its proper divisors (440482911).

1218922977 is a wasteful number, since it uses less digits than its factorization.

1218922977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43520.

The product of its digits is 254016, while the sum is 48.

The square root of 1218922977 is about 34913.0774495747. The cubic root of 1218922977 is about 1068.2152028496.

The spelling of 1218922977 in words is "one billion, two hundred eighteen million, nine hundred twenty-two thousand, nine hundred seventy-seven".