40001540 has 24 divisors (see below), whose sum is σ = 84181272. Its totient is φ = 15966720.

The previous prime is 40001519. The next prime is 40001557. The reversal of 40001540 is 4510004.

It can be written as a sum of positive squares in 4 ways, for example, as 33856 + 39967684 = 184^2 + 6322^2 .

40001540 is a modest number, since divided by 1540 gives 40 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8972 + ... + 12668.

It is an arithmetic number, because the mean of its divisors is an integer number (3507553).

Almost surely, 2^40001540 is an apocalyptic number.

It is an amenable number.

40001540 is an abundant number, since it is smaller than the sum of its proper divisors (44179732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40001540 is a wasteful number, since it uses less digits than its factorization.

40001540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247 (or 4245 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40001540 is about 6324.6770668549. The cubic root of 40001540 is about 341.9995782173. Note that the first 3 decimals are identical.

Adding to 40001540 its reverse (4510004), we get a palindrome (44511544).

The spelling of 40001540 in words is "forty million, one thousand, five hundred forty".