406004400605 has 16 divisors (see below), whose sum is σ = 504580313520. Its totient is φ = 313245714432.

The previous prime is 406004400587. The next prime is 406004400631. The reversal of 406004400605 is 506004400604.

It can be written as a sum of positive squares in 8 ways, for example, as 40672402276 + 365331998329 = 201674^2 + 604427^2 .

It is a cyclic number.

It is not a de Polignac number, because 406004400605 - 2²² = 406000206301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1469204 + ... + 1723533.

It is an arithmetic number, because the mean of its divisors is an integer number (31536269595).

Almost surely, 2^406004400605 is an apocalyptic number.

It is an amenable number.

406004400605 is a deficient number, since it is larger than the sum of its proper divisors (98575912915).

406004400605 is a wasteful number, since it uses less digits than its factorization.

406004400605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193648.

The product of its (nonzero) digits is 11520, while the sum is 29.

Subtracting 406004400605 from its reverse (506004400604), we obtain a palindrome (99999999999).

The spelling of 406004400605 in words is "four hundred six billion, four million, four hundred thousand, six hundred five".