40338689 has 4 divisors (see below), whose sum is σ = 40379220. Its totient is φ = 40298160.

The previous prime is 40338667. The next prime is 40338707. The reversal of 40338689 is 98683304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15737089 + 24601600 = 3967^2 + 4960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40338689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40338589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18734 + ... + 20775.

It is an arithmetic number, because the mean of its divisors is an integer number (10094805).

Almost surely, 2^40338689 is an apocalyptic number.

It is an amenable number.

40338689 is a deficient number, since it is larger than the sum of its proper divisors (40531).

40338689 is a wasteful number, since it uses less digits than its factorization.

40338689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40530.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 40338689 is about 6351.2745964885. The cubic root of 40338689 is about 342.9577278212.

The spelling of 40338689 in words is "forty million, three hundred thirty-eight thousand, six hundred eighty-nine".