1249821646434 has 24 divisors (see below), whose sum is σ = 2707968320460. Its totient is φ = 416603920128.

The previous prime is 1249821646399. The next prime is 1249821646439. The reversal of 1249821646434 is 4346461289421.

1249821646434 is a `hidden beast` number, since 1 + 2 + 49 + 8 + 2 + 164 + 6 + 434 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1068215267025 + 181606379409 = 1033545^2 + 426153^2 .

It is not an unprimeable number, because it can be changed into a prime (1249821646439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3375382 + ... + 3727310.

Almost surely, 2^{1249821646434} is an apocalyptic number.

1249821646434 is an abundant number, since it is smaller than the sum of its proper divisors (1458146674026).

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

1249821646434 is a wasteful number, since it uses less digits than its factorization.

1249821646434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549234 (or 549231 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 54.

The spelling of 1249821646434 in words is "one trillion, two hundred forty-nine billion, eight hundred twenty-one million, six hundred forty-six thousand, four hundred thirty-four".