1240634881 has 16 divisors (see below), whose sum is σ = 1319616000. Its totient is φ = 1163942208.

The previous prime is 1240634851. The next prime is 1240634893. The reversal of 1240634881 is 1884360421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240634881 is a prime.

It is a super-2 number, since 2×1240634881² = 3078349815907768322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1240634881.

It is not an unprimeable number, because it can be changed into a prime (1240634821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283095 + ... + 287443.

It is an arithmetic number, because the mean of its divisors is an integer number (82476000).

Almost surely, 2^1240634881 is an apocalyptic number.

It is an amenable number.

1240634881 is a deficient number, since it is larger than the sum of its proper divisors (78981119).

1240634881 is a wasteful number, since it uses less digits than its factorization.

1240634881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 1240634881 is about 35222.6472741615. The cubic root of 1240634881 is about 1074.5203935210.

The spelling of 1240634881 in words is "one billion, two hundred forty million, six hundred thirty-four thousand, eight hundred eighty-one".