40405538 has 4 divisors (see below), whose sum is σ = 60608310. Its totient is φ = 20202768.

The previous prime is 40405529. The next prime is 40405543. The reversal of 40405538 is 83550404.

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

It can be written as a sum of positive squares in only one way, i.e., 35129329 + 5276209 = 5927^2 + 2297^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40405538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101383 + ... + 10101386.

Almost surely, 2^40405538 is an apocalyptic number.

40405538 is a deficient number, since it is larger than the sum of its proper divisors (20202772).

40405538 is a wasteful number, since it uses less digits than its factorization.

40405538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20202771.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 40405538 is about 6356.5350624377. The cubic root of 40405538 is about 343.1470723346.

The spelling of 40405538 in words is "forty million, four hundred five thousand, five hundred thirty-eight".