40018815 has 24 divisors (see below), whose sum is σ = 70546320. Its totient is φ = 20980224.

The previous prime is 40018757. The next prime is 40018859. The reversal of 40018815 is 51881004.

It is not a de Polignac number, because 40018815 - 2⁶ = 40018751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4882 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (2939430).

Almost surely, 2^40018815 is an apocalyptic number.

40018815 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40018815 is a deficient number, since it is larger than the sum of its proper divisors (30527505).

40018815 is a wasteful number, since it uses less digits than its factorization.

40018815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15143 (or 15140 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 40018815 is about 6326.0426018167. The cubic root of 40018815 is about 342.0488029258.

Adding to 40018815 its reverse (51881004), we get a palindrome (91899819).

The spelling of 40018815 in words is "forty million, eighteen thousand, eight hundred fifteen".