40021115 has 4 divisors (see below), whose sum is σ = 48025344. Its totient is φ = 32016888.

The previous prime is 40021061. The next prime is 40021117. The reversal of 40021115 is 51112004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40021115 - 2²² = 35826811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40021115.

It is not an unprimeable number, because it can be changed into a prime (40021117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4002107 + ... + 4002116.

It is an arithmetic number, because the mean of its divisors is an integer number (12006336).

Almost surely, 2^40021115 is an apocalyptic number.

40021115 is a deficient number, since it is larger than the sum of its proper divisors (8004229).

40021115 is an equidigital number, since it uses as much as digits as its factorization.

40021115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004228.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 40021115 is about 6326.2243874210. The cubic root of 40021115 is about 342.0553556533.

Adding to 40021115 its reverse (51112004), we get a palindrome (91133119).

The spelling of 40021115 in words is "forty million, twenty-one thousand, one hundred fifteen".