40020015 has 24 divisors (see below), whose sum is σ = 74487600. Its totient is φ = 18294528.

The previous prime is 40020011. The next prime is 40020017. The reversal of 40020015 is 51002004.

It is not a de Polignac number, because 40020015 - 2² = 40020011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26490 + ... + 27959.

It is an arithmetic number, because the mean of its divisors is an integer number (3103650).

Almost surely, 2^40020015 is an apocalyptic number.

40020015 is a deficient number, since it is larger than the sum of its proper divisors (34467585).

40020015 is a wasteful number, since it uses less digits than its factorization.

40020015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54471 (or 54464 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40020015 is about 6326.1374471315. The cubic root of 40020015 is about 342.0522217715.

Adding to 40020015 its reverse (51002004), we get a palindrome (91022019).

The spelling of 40020015 in words is "forty million, twenty thousand, fifteen".