40642331 has 4 divisors (see below), whose sum is σ = 40747200. Its totient is φ = 40537464.

The previous prime is 40642319. The next prime is 40642337. The reversal of 40642331 is 13324604.

It is a happy number.

40642331 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40642331 is a prime.

It is a super-2 number, since 2×40642331² = 3303598138227122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40642297 and 40642306.

It is not an unprimeable number, because it can be changed into a prime (40642337) by changing a digit.

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, 51851 + ... + 52628.

It is an arithmetic number, because the mean of its divisors is an integer number (10186800).

Almost surely, 2^40642331 is an apocalyptic number.

40642331 is a deficient number, since it is larger than the sum of its proper divisors (104869).

40642331 is a wasteful number, since it uses less digits than its factorization.

40642331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104868.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 40642331 is about 6375.1338025174. The cubic root of 40642331 is about 343.8160945746.

Adding to 40642331 its reverse (13324604), we get a palindrome (53966935).

The spelling of 40642331 in words is "forty million, six hundred forty-two thousand, three hundred thirty-one".