36639643 has 2 divisors, whose sum is σ = 36639644. Its totient is φ = 36639642.

The previous prime is 36639637. The next prime is 36639653. The reversal of 36639643 is 34693663.

It is a weak prime.

It is an emirp because it is prime and its reverse (34693663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36639643 - 2¹³ = 36631451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 36639596 and 36639605.

It is not a weakly prime, because it can be changed into another prime (36639653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18319821 + 18319822.

It is an arithmetic number, because the mean of its divisors is an integer number (18319822).

Almost surely, 2^36639643 is an apocalyptic number.

36639643 is a deficient number, since it is larger than the sum of its proper divisors (1).

36639643 is an equidigital number, since it uses as much as digits as its factorization.

36639643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 40.

The square root of 36639643 is about 6053.0688910667. The cubic root of 36639643 is about 332.1368617277.

The spelling of 36639643 in words is "thirty-six million, six hundred thirty-nine thousand, six hundred forty-three".