40591538 has 8 divisors (see below), whose sum is σ = 65570988. Its totient is φ = 18734544.

The previous prime is 40591531. The next prime is 40591541. The reversal of 40591538 is 83519504.

It can be written as a sum of positive squares in 2 ways, for example, as 38651089 + 1940449 = 6217^2 + 1393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 40591498 and 40591507.

It is not an unprimeable number, because it can be changed into a prime (40591531) 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, 780581 + ... + 780632.

Almost surely, 2^40591538 is an apocalyptic number.

40591538 is a deficient number, since it is larger than the sum of its proper divisors (24979450).

40591538 is a wasteful number, since it uses less digits than its factorization.

40591538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561228.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 40591538 is about 6371.1488759878. The cubic root of 40591538 is about 343.6728061154.

The spelling of 40591538 in words is "forty million, five hundred ninety-one thousand, five hundred thirty-eight".