40406403 has 4 divisors (see below), whose sum is σ = 53875208. Its totient is φ = 26937600.

The previous prime is 40406383. The next prime is 40406437. The reversal of 40406403 is 30460404.

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

It is not a de Polignac number, because 40406403 - 2²¹ = 38309251 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 40406403.

It is not an unprimeable number, because it can be changed into a prime (40406503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6734398 + ... + 6734403.

It is an arithmetic number, because the mean of its divisors is an integer number (13468802).

Almost surely, 2^40406403 is an apocalyptic number.

40406403 is a deficient number, since it is larger than the sum of its proper divisors (13468805).

40406403 is a wasteful number, since it uses less digits than its factorization.

40406403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468804.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 40406403 is about 6356.6031022866. The cubic root of 40406403 is about 343.1495210096.

Adding to 40406403 its reverse (30460404), we get a palindrome (70866807).

The spelling of 40406403 in words is "forty million, four hundred six thousand, four hundred three".