40280403 has 4 divisors (see below), whose sum is σ = 53707208. Its totient is φ = 26853600.

The previous prime is 40280389. The next prime is 40280407. The reversal of 40280403 is 30408204.

It is a happy number.

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

It is not a de Polignac number, because 40280403 - 2⁸ = 40280147 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 40280403.

It is not an unprimeable number, because it can be changed into a prime (40280407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6713398 + ... + 6713403.

It is an arithmetic number, because the mean of its divisors is an integer number (13426802).

Almost surely, 2^40280403 is an apocalyptic number.

40280403 is a deficient number, since it is larger than the sum of its proper divisors (13426805).

40280403 is a wasteful number, since it uses less digits than its factorization.

40280403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13426804.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 40280403 is about 6346.6844099892. The cubic root of 40280403 is about 342.7924665453.

Adding to 40280403 its reverse (30408204), we get a palindrome (70688607).

The spelling of 40280403 in words is "forty million, two hundred eighty thousand, four hundred three".