40308736 has 52 divisors (see below), whose sum is σ = 86922892. Its totient is φ = 18579456.

The previous prime is 40308733. The next prime is 40308743. The reversal of 40308736 is 63780304.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 25563136 = 3840^2 + 5056^2 .

It is a tau number, because it is divible by the number of its divisors (52).

It is a junction number, because it is equal to n+sod(n) for n = 40308698 and 40308707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40308731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52870 + ... + 53626.

Almost surely, 2^40308736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40308736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43461446).

40308736 is an abundant number, since it is smaller than the sum of its proper divisors (46614156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40308736 is an equidigital number, since it uses as much as digits as its factorization.

40308736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 40308736 is about 6348.9161279702. The cubic root of 40308736 is about 342.8728204471.

The spelling of 40308736 in words is "forty million, three hundred eight thousand, seven hundred thirty-six".