40001515 has 8 divisors (see below), whose sum is σ = 48052368. Its totient is φ = 31967520.

The previous prime is 40001509. The next prime is 40001519. The reversal of 40001515 is 51510004.

It is a happy number.

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

It is not a de Polignac number, because 40001515 - 2⁵ = 40001483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40001519) 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, 1789 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (6006546).

Almost surely, 2^40001515 is an apocalyptic number.

40001515 is a deficient number, since it is larger than the sum of its proper divisors (8050853).

40001515 is a wasteful number, since it uses less digits than its factorization.

40001515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8429.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 40001515 is about 6324.6750904691. The cubic root of 40001515 is about 341.9995069701. Note that the first 3 decimals are identical.

Adding to 40001515 its reverse (51510004), we get a palindrome (91511519).

The spelling of 40001515 in words is "forty million, one thousand, five hundred fifteen".