405940399 has 8 divisors (see below), whose sum is σ = 430228800. Its totient is φ = 381697536.

The previous prime is 405940391. The next prime is 405940429. The reversal of 405940399 is 993049504.

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 405940399 - 2³ = 405940391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405940391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7927 + ... + 29575.

It is an arithmetic number, because the mean of its divisors is an integer number (53778600).

Almost surely, 2^405940399 is an apocalyptic number.

405940399 is a deficient number, since it is larger than the sum of its proper divisors (24288401).

405940399 is a wasteful number, since it uses less digits than its factorization.

405940399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22769.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 405940399 is about 20147.9626513452. The cubic root of 405940399 is about 740.4358273911.

The spelling of 405940399 in words is "four hundred five million, nine hundred forty thousand, three hundred ninety-nine".