40642394 has 16 divisors (see below), whose sum is σ = 66260040. Its totient is φ = 18584640.

The previous prime is 40642373. The next prime is 40642397. The reversal of 40642394 is 49324604.

40642394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19140625 + 21501769 = 4375^2 + 4637^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40642394.

It is not an unprimeable number, because it can be changed into a prime (40642397) 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 7 ways as a sum of consecutive naturals, for example, 4337 + ... + 10004.

Almost surely, 2^40642394 is an apocalyptic number.

40642394 is a deficient number, since it is larger than the sum of its proper divisors (25617646).

40642394 is a wasteful number, since it uses less digits than its factorization.

40642394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14465.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 40642394 is about 6375.1387435883. The cubic root of 40642394 is about 343.8162722252.

Adding to 40642394 its reverse (49324604), we get a palindrome (89966998).

The spelling of 40642394 in words is "forty million, six hundred forty-two thousand, three hundred ninety-four".