40721536 has 16 divisors (see below), whose sum is σ = 81125190. Its totient is φ = 20360704.

The previous prime is 40721531. The next prime is 40721567. The reversal of 40721536 is 63512704.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 9985600 = 5544^2 + 3160^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (40721531) 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 as a sum of consecutive naturals, namely, 158941 + ... + 159196.

Almost surely, 2^40721536 is an apocalyptic number.

It is an amenable number.

40721536 is a deficient number, since it is larger than the sum of its proper divisors (40403654).

40721536 is an equidigital number, since it uses as much as digits as its factorization.

40721536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318151 (or 318139 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 40721536 is about 6381.3428053976. The cubic root of 40721536 is about 344.0392960337.

The spelling of 40721536 in words is "forty million, seven hundred twenty-one thousand, five hundred thirty-six".