36886721 has 4 divisors (see below), whose sum is σ = 36959700. Its totient is φ = 36813744.

The previous prime is 36886699. The next prime is 36886723. The reversal of 36886721 is 12768863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12768863 = 349 ⋅36587.

It can be written as a sum of positive squares in 2 ways, for example, as 15366400 + 21520321 = 3920^2 + 4639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36886721 is a prime.

It is a super-2 number, since 2×36886721² = 2721260372263682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36886723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35726 + ... + 36743.

It is an arithmetic number, because the mean of its divisors is an integer number (9239925).

Almost surely, 2^36886721 is an apocalyptic number.

It is an amenable number.

36886721 is a deficient number, since it is larger than the sum of its proper divisors (72979).

36886721 is an equidigital number, since it uses as much as digits as its factorization.

36886721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72978.

The product of its digits is 96768, while the sum is 41.

The square root of 36886721 is about 6073.4439159344. The cubic root of 36886721 is about 332.8817737804.

The spelling of 36886721 in words is "thirty-six million, eight hundred eighty-six thousand, seven hundred twenty-one".