905405 has 4 divisors (see below), whose sum is σ = 1086492. Its totient is φ = 724320.

The previous prime is 905381. The next prime is 905413. The reversal of 905405 is 504509.

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 120409 + 784996 = 347^2 + 886^2 .

It is not a de Polignac number, because 905405 - 2¹² = 901309 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, 90536 + ... + 90545.

It is an arithmetic number, because the mean of its divisors is an integer number (271623).

2⁹⁰⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

905405 is a deficient number, since it is larger than the sum of its proper divisors (181087).

905405 is a wasteful number, since it uses less digits than its factorization.

905405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181086.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 905405 is about 951.5277189867. The cubic root of 905405 is about 96.7418295063.

The spelling of 905405 in words is "nine hundred five thousand, four hundred five".