40391336 has 8 divisors (see below), whose sum is σ = 75733770. Its totient is φ = 20195664.

The previous prime is 40391327. The next prime is 40391339. The reversal of 40391336 is 63319304.

It can be written as a sum of positive squares in only one way, i.e., 38514436 + 1876900 = 6206^2 + 1370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 40391299 and 40391308.

It is not an unprimeable number, because it can be changed into a prime (40391339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2524451 + ... + 2524466.

Almost surely, 2^40391336 is an apocalyptic number.

It is an amenable number.

40391336 is a deficient number, since it is larger than the sum of its proper divisors (35342434).

40391336 is a wasteful number, since it uses less digits than its factorization.

40391336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048923 (or 5048919 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 40391336 is about 6355.4178462159. The cubic root of 40391336 is about 343.1068637720.

The spelling of 40391336 in words is "forty million, three hundred ninety-one thousand, three hundred thirty-six".