1218553944 has 32 divisors (see below), whose sum is σ = 3051489840. Its totient is φ = 405504000.

The previous prime is 1218553937. The next prime is 1218553957. The reversal of 1218553944 is 4493558121.

It is a junction number, because it is equal to n+sod(n) for n = 1218553896 and 1218553905.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27817 + ... + 56664.

Almost surely, 2^1218553944 is an apocalyptic number.

It is an amenable number.

1218553944 is an abundant number, since it is smaller than the sum of its proper divisors (1832935896).

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

1218553944 is a wasteful number, since it uses less digits than its factorization.

1218553944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85091 (or 85087 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 1218553944 is about 34907.7920241312. The cubic root of 1218553944 is about 1068.1073900626.

The spelling of 1218553944 in words is "one billion, two hundred eighteen million, five hundred fifty-three thousand, nine hundred forty-four".