36393721 has 48 divisors (see below), whose sum is σ = 50050560. Its totient is φ = 26127360.

The previous prime is 36393689. The next prime is 36393727. The reversal of 36393721 is 12739363.

It is not a de Polignac number, because 36393721 - 2⁵ = 36393689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (36393727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 375145 + ... + 375241.

It is an arithmetic number, because the mean of its divisors is an integer number (1042720).

Almost surely, 2^36393721 is an apocalyptic number.

36393721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

36393721 is a deficient number, since it is larger than the sum of its proper divisors (13656839).

36393721 is a wasteful number, since it uses less digits than its factorization.

36393721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 167 counting only the distinct ones).

The product of its digits is 20412, while the sum is 34.

The square root of 36393721 is about 6032.7208620986. The cubic root of 36393721 is about 331.3921020312.

The spelling of 36393721 in words is "thirty-six million, three hundred ninety-three thousand, seven hundred twenty-one".