40213165 has 4 divisors (see below), whose sum is σ = 48255804. Its totient is φ = 32170528.

The previous prime is 40213093. The next prime is 40213171. The reversal of 40213165 is 56131204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 27688644 = 3539^2 + 5262^2 .

It is a cyclic number.

It is not a de Polignac number, because 40213165 - 2¹¹ = 40211117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4021312 + ... + 4021321.

It is an arithmetic number, because the mean of its divisors is an integer number (12063951).

Almost surely, 2^40213165 is an apocalyptic number.

It is an amenable number.

40213165 is a deficient number, since it is larger than the sum of its proper divisors (8042639).

40213165 is an equidigital number, since it uses as much as digits as its factorization.

40213165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8042638.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 40213165 is about 6341.3851010643. The cubic root of 40213165 is about 342.6016250549.

Adding to 40213165 its reverse (56131204), we get a palindrome (96344369).

The spelling of 40213165 in words is "forty million, two hundred thirteen thousand, one hundred sixty-five".