402440405 has 8 divisors (see below), whose sum is σ = 511336152. Its totient is φ = 303013888.

The previous prime is 402440383. The next prime is 402440411. The reversal of 402440405 is 504044204.

It can be written as a sum of positive squares in 4 ways, for example, as 15413476 + 387026929 = 3926^2 + 19673^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 402440405 - 2¹⁰ = 402439381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2367212 + ... + 2367381.

It is an arithmetic number, because the mean of its divisors is an integer number (63917019).

Almost surely, 2^402440405 is an apocalyptic number.

It is an amenable number.

402440405 is a deficient number, since it is larger than the sum of its proper divisors (108895747).

402440405 is a wasteful number, since it uses less digits than its factorization.

402440405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734615.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 402440405 is about 20060.9173519059. The cubic root of 402440405 is about 738.3016842004.

Adding to 402440405 its reverse (504044204), we get a palindrome (906484609).

The spelling of 402440405 in words is "four hundred two million, four hundred forty thousand, four hundred five".