1234681816 has 8 divisors (see below), whose sum is σ = 2315028420. Its totient is φ = 617340904.

The previous prime is 1234681813. The next prime is 1234681843. The reversal of 1234681816 is 6181864321.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1234681816² = 3048878373522115712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234681813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77167606 + ... + 77167621.

Almost surely, 2^1234681816 is an apocalyptic number.

It is an amenable number.

1234681816 is a deficient number, since it is larger than the sum of its proper divisors (1080346604).

1234681816 is a wasteful number, since it uses less digits than its factorization.

1234681816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154335233 (or 154335229 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 1234681816 is about 35138.0394444539. The cubic root of 1234681816 is about 1072.7989769294.

The spelling of 1234681816 in words is "one billion, two hundred thirty-four million, six hundred eighty-one thousand, eight hundred sixteen".