1218290461940 has 24 divisors (see below), whose sum is σ = 2708904674952. Its totient is φ = 458650526720.

The previous prime is 1218290461931. The next prime is 1218290461963. The reversal of 1218290461940 is 491640928121.

It can be written as a sum of positive squares in 4 ways, for example, as 212257389796 + 1006033072144 = 460714^2 + 1003012^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1791603281 + ... + 1791603960.

It is an arithmetic number, because the mean of its divisors is an integer number (112871028123).

Almost surely, 2^{1218290461940} is an apocalyptic number.

1218290461940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218290461940 is an abundant number, since it is smaller than the sum of its proper divisors (1490614213012).

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

1218290461940 is a wasteful number, since it uses less digits than its factorization.

1218290461940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583207267 (or 3583207265 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 1218290461940 in words is "one trillion, two hundred eighteen billion, two hundred ninety million, four hundred sixty-one thousand, nine hundred forty".