40138537 has 4 divisors (see below), whose sum is σ = 40151376. Its totient is φ = 40125700.

The previous prime is 40138529. The next prime is 40138577. The reversal of 40138537 is 73583104.

40138537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40138537 - 2³ = 40138529 is a prime.

It is a super-2 number, since 2×40138537² = 3222204305000738, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40138499 and 40138508.

It is not an unprimeable number, because it can be changed into a prime (40138577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662 + ... + 9112.

It is an arithmetic number, because the mean of its divisors is an integer number (10037844).

Almost surely, 2^40138537 is an apocalyptic number.

It is an amenable number.

40138537 is a deficient number, since it is larger than the sum of its proper divisors (12839).

40138537 is an equidigital number, since it uses as much as digits as its factorization.

40138537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40138537 is about 6335.4981651011. The cubic root of 40138537 is about 342.3895592911.

The spelling of 40138537 in words is "forty million, one hundred thirty-eight thousand, five hundred thirty-seven".