1235996643 has 16 divisors (see below), whose sum is σ = 1883914496. Its totient is φ = 706099680.

The previous prime is 1235996621. The next prime is 1235996651. The reversal of 1235996643 is 3466995321.

It is not a de Polignac number, because 1235996643 - 2¹² = 1235992547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1235996592 and 1235996601.

It is not an unprimeable number, because it can be changed into a prime (1235996603) 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 in 15 ways as a sum of consecutive naturals, for example, 156180 + ... + 163902.

It is an arithmetic number, because the mean of its divisors is an integer number (117744656).

Almost surely, 2^1235996643 is an apocalyptic number.

1235996643 is a deficient number, since it is larger than the sum of its proper divisors (647917853).

1235996643 is an equidigital number, since it uses as much as digits as its factorization.

1235996643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15354.

The product of its digits is 1049760, while the sum is 48.

The square root of 1235996643 is about 35156.7439191971. The cubic root of 1235996643 is about 1073.1796538607.

The spelling of 1235996643 in words is "one billion, two hundred thirty-five million, nine hundred ninety-six thousand, six hundred forty-three".