1240894481018 has 4 divisors (see below), whose sum is σ = 1861341721530. Its totient is φ = 620447240508.

The previous prime is 1240894480993. The next prime is 1240894481059. The reversal of 1240894481018 is 8101844980421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1233981057409 + 6913423609 = 1110847^2 + 83147^2 .

It is a super-2 number, since 2×1240894481018² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310223620253 + ... + 310223620256.

Almost surely, 2^{1240894481018} is an apocalyptic number.

1240894481018 is a deficient number, since it is larger than the sum of its proper divisors (620447240512).

1240894481018 is an equidigital number, since it uses as much as digits as its factorization.

1240894481018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620447240511.

The product of its (nonzero) digits is 589824, while the sum is 50.

The spelling of 1240894481018 in words is "one trillion, two hundred forty billion, eight hundred ninety-four million, four hundred eighty-one thousand, eighteen".