40515999 has 16 divisors (see below), whose sum is σ = 58404480. Its totient is φ = 24896160.

The previous prime is 40515991. The next prime is 40516001. The reversal of 40515999 is 99951504.

It is a happy number.

It is not a de Polignac number, because 40515999 - 2³ = 40515991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40515999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40515991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7497 + ... + 11714.

It is an arithmetic number, because the mean of its divisors is an integer number (3650280).

Almost surely, 2^40515999 is an apocalyptic number.

40515999 is a deficient number, since it is larger than the sum of its proper divisors (17888481).

40515999 is a wasteful number, since it uses less digits than its factorization.

40515999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19270.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 40515999 is about 6365.2179067177. The cubic root of 40515999 is about 343.4594872650.

It can be divided in two parts, 40515 and 999, that added together give a palindrome (41514).

The spelling of 40515999 in words is "forty million, five hundred fifteen thousand, nine hundred ninety-nine".