40309768 has 32 divisors (see below), whose sum is σ = 78586200. Its totient is φ = 19360768.

The previous prime is 40309751. The next prime is 40309769. The reversal of 40309768 is 86790304.

It can be written as a sum of positive squares in 4 ways, for example, as 40220964 + 88804 = 6342^2 + 298^2 .

It is not an unprimeable number, because it can be changed into a prime (40309769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67680 + ... + 68272.

Almost surely, 2^40309768 is an apocalyptic number.

It is an amenable number.

40309768 is a deficient number, since it is larger than the sum of its proper divisors (38276432).

40309768 is a wasteful number, since it uses less digits than its factorization.

40309768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 40309768 is about 6348.9974011650. The cubic root of 40309768 is about 342.8757465434.

The spelling of 40309768 in words is "forty million, three hundred nine thousand, seven hundred sixty-eight".