36729821 has 2 divisors, whose sum is σ = 36729822. Its totient is φ = 36729820.

The previous prime is 36729817. The next prime is 36729829. The reversal of 36729821 is 12892763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 16605625 = 4486^2 + 4075^2 .

It is a cyclic number.

It is not a de Polignac number, because 36729821 - 2² = 36729817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36729829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18364910 + 18364911.

It is an arithmetic number, because the mean of its divisors is an integer number (18364911).

Almost surely, 2^36729821 is an apocalyptic number.

It is an amenable number.

36729821 is a deficient number, since it is larger than the sum of its proper divisors (1).

36729821 is an equidigital number, since it uses as much as digits as its factorization.

36729821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 36729821 is about 6060.5132620926. The cubic root of 36729821 is about 332.4091251080.

The spelling of 36729821 in words is "thirty-six million, seven hundred twenty-nine thousand, eight hundred twenty-one".