405939605 has 4 divisors (see below), whose sum is σ = 487127532. Its totient is φ = 324751680.

The previous prime is 405939577. The next prime is 405939613. The reversal of 405939605 is 506939504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 208340356 + 197599249 = 14434^2 + 14057^2 .

It is not a de Polignac number, because 405939605 - 2¹⁶ = 405874069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40593956 + ... + 40593965.

It is an arithmetic number, because the mean of its divisors is an integer number (121781883).

Almost surely, 2^405939605 is an apocalyptic number.

It is an amenable number.

405939605 is a deficient number, since it is larger than the sum of its proper divisors (81187927).

405939605 is an equidigital number, since it uses as much as digits as its factorization.

405939605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81187926.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 405939605 is about 20147.9429471100. The cubic root of 405939605 is about 740.4353446385.

The spelling of 405939605 in words is "four hundred five million, nine hundred thirty-nine thousand, six hundred five".