405006655 has 16 divisors (see below), whose sum is σ = 516715200. Its totient is φ = 304066048.

The previous prime is 405006643. The next prime is 405006671. The reversal of 405006655 is 556600504.

It is a cyclic number.

It is not a de Polignac number, because 405006655 - 2¹⁵ = 404973887 is a prime.

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, 27130 + ... + 39319.

It is an arithmetic number, because the mean of its divisors is an integer number (32294700).

Almost surely, 2^405006655 is an apocalyptic number.

405006655 is a deficient number, since it is larger than the sum of its proper divisors (111708545).

405006655 is a wasteful number, since it uses less digits than its factorization.

405006655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66530.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 405006655 is about 20124.7771416232. Note that the first 3 decimals coincide. The cubic root of 405006655 is about 739.8676747810.

The spelling of 405006655 in words is "four hundred five million, six thousand, six hundred fifty-five".