40402423 has 4 divisors (see below), whose sum is σ = 41795640. Its totient is φ = 39009208.

The previous prime is 40402403. The next prime is 40402441. The reversal of 40402423 is 32420404.

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-40402423 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 40402423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40402403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696565 + ... + 696622.

It is an arithmetic number, because the mean of its divisors is an integer number (10448910).

Almost surely, 2^40402423 is an apocalyptic number.

40402423 is a deficient number, since it is larger than the sum of its proper divisors (1393217).

40402423 is a wasteful number, since it uses less digits than its factorization.

40402423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393216.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 40402423 is about 6356.2900342889. The cubic root of 40402423 is about 343.1382539840.

Adding to 40402423 its reverse (32420404), we get a palindrome (72822827).

The spelling of 40402423 in words is "forty million, four hundred two thousand, four hundred twenty-three".