43640338 has 32 divisors (see below), whose sum is σ = 78494976. Its totient is φ = 17791488.

The previous prime is 43640329. The next prime is 43640339. The reversal of 43640338 is 83304634.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (43640339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100570 + ... + 101002.

It is an arithmetic number, because the mean of its divisors is an integer number (2452968).

Almost surely, 2^43640338 is an apocalyptic number.

43640338 is a deficient number, since it is larger than the sum of its proper divisors (34854638).

43640338 is a wasteful number, since it uses less digits than its factorization.

43640338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 43640338 is about 6606.0834084955. The cubic root of 43640338 is about 352.0702823246.

The spelling of 43640338 in words is "forty-three million, six hundred forty thousand, three hundred thirty-eight".