405778255 has 4 divisors (see below), whose sum is σ = 486933912. Its totient is φ = 324622600.

The previous prime is 405778199. The next prime is 405778273. The reversal of 405778255 is 552877504.

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

It is a de Polignac number, because none of the positive numbers 2^k-405778255 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, 40577821 + ... + 40577830.

It is an arithmetic number, because the mean of its divisors is an integer number (121733478).

Almost surely, 2^405778255 is an apocalyptic number.

405778255 is a deficient number, since it is larger than the sum of its proper divisors (81155657).

405778255 is an equidigital number, since it uses as much as digits as its factorization.

405778255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81155656.

The product of its (nonzero) digits is 392000, while the sum is 43.

The square root of 405778255 is about 20143.9384182935. The cubic root of 405778255 is about 740.3372306387.

The spelling of 405778255 in words is "four hundred five million, seven hundred seventy-eight thousand, two hundred fifty-five".