36942721 has 2 divisors, whose sum is σ = 36942722. Its totient is φ = 36942720.

The previous prime is 36942679. The next prime is 36942733. The reversal of 36942721 is 12724963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26471025 + 10471696 = 5145^2 + 3236^2 .

It is an emirp because it is prime and its reverse (12724963) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 36942721 - 2¹⁹ = 36418433 is a prime.

It is not a weakly prime, because it can be changed into another prime (36943721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18471360 + 18471361.

It is an arithmetic number, because the mean of its divisors is an integer number (18471361).

Almost surely, 2^36942721 is an apocalyptic number.

It is an amenable number.

36942721 is a deficient number, since it is larger than the sum of its proper divisors (1).

36942721 is an equidigital number, since it uses as much as digits as its factorization.

36942721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 36942721 is about 6078.0524018801. The cubic root of 36942721 is about 333.0501447030.

The spelling of 36942721 in words is "thirty-six million, nine hundred forty-two thousand, seven hundred twenty-one".