36188721 has 8 divisors (see below), whose sum is σ = 53612960. Its totient is φ = 24125796.

The previous prime is 36188717. The next prime is 36188743. The reversal of 36188721 is 12788163.

It is not a de Polignac number, because 36188721 - 2² = 36188717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36186721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670135 + ... + 670188.

It is an arithmetic number, because the mean of its divisors is an integer number (6701620).

Almost surely, 2^36188721 is an apocalyptic number.

It is an amenable number.

36188721 is a deficient number, since it is larger than the sum of its proper divisors (17424239).

36188721 is a wasteful number, since it uses less digits than its factorization.

36188721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340332 (or 1340326 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 36188721 is about 6015.7061929586. The cubic root of 36188721 is about 330.7687038543.

The spelling of 36188721 in words is "thirty-six million, one hundred eighty-eight thousand, seven hundred twenty-one".