40405426 has 8 divisors (see below), whose sum is σ = 60647580. Its totient is φ = 20189568.

The previous prime is 40405399. The next prime is 40405429. The reversal of 40405426 is 62450404.

It can be written as a sum of positive squares in 2 ways, for example, as 40335201 + 70225 = 6351^2 + 265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40405426.

It is not an unprimeable number, because it can be changed into a prime (40405429) 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, 2131 + ... + 9238.

Almost surely, 2^40405426 is an apocalyptic number.

40405426 is a deficient number, since it is larger than the sum of its proper divisors (20242154).

40405426 is a wasteful number, since it uses less digits than its factorization.

40405426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13148.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 40405426 is about 6356.5262526006. The cubic root of 40405426 is about 343.1467552781.

The spelling of 40405426 in words is "forty million, four hundred five thousand, four hundred twenty-six".