40213645 has 4 divisors (see below), whose sum is σ = 48256380. Its totient is φ = 32170912.

The previous prime is 40213639. The next prime is 40213651. The reversal of 40213645 is 54631204.

40213645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (40213639) and next prime (40213651).

It can be written as a sum of positive squares in 2 ways, for example, as 23222761 + 16990884 = 4819^2 + 4122^2 .

It is a cyclic number.

It is not a de Polignac number, because 40213645 - 2¹¹ = 40211597 is a prime.

It is a super-3 number, since 3×40213645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4021360 + ... + 4021369.

It is an arithmetic number, because the mean of its divisors is an integer number (12064095).

Almost surely, 2^40213645 is an apocalyptic number.

It is an amenable number.

40213645 is a deficient number, since it is larger than the sum of its proper divisors (8042735).

40213645 is an equidigital number, since it uses as much as digits as its factorization.

40213645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8042734.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 40213645 is about 6341.4229475726. The cubic root of 40213645 is about 342.6029881916.

Adding to 40213645 its reverse (54631204), we get a palindrome (94844849).

The spelling of 40213645 in words is "forty million, two hundred thirteen thousand, six hundred forty-five".