40538578 has 16 divisors (see below), whose sum is σ = 63060480. Its totient is φ = 19521936.

The previous prime is 40538573. The next prime is 40538599. The reversal of 40538578 is 87583504.

It is a self number, because there is not a number n which added to its sum of digits gives 40538578.

It is not an unprimeable number, because it can be changed into a prime (40538573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36751 + ... + 37837.

It is an arithmetic number, because the mean of its divisors is an integer number (3941280).

Almost surely, 2^40538578 is an apocalyptic number.

40538578 is a deficient number, since it is larger than the sum of its proper divisors (22521902).

40538578 is a wasteful number, since it uses less digits than its factorization.

40538578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 40538578 is about 6366.9912831729. The cubic root of 40538578 is about 343.5232771408.

It can be divided in two parts, 405 and 38578, that added together give a palindrome (38983).

The spelling of 40538578 in words is "forty million, five hundred thirty-eight thousand, five hundred seventy-eight".