813455 has 4 divisors (see below), whose sum is σ = 976152. Its totient is φ = 650760.

The previous prime is 813443. The next prime is 813493. The reversal of 813455 is 554318.

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

It is not a de Polignac number, because 813455 - 2⁸ = 813199 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81341 + ... + 81350.

It is an arithmetic number, because the mean of its divisors is an integer number (244038).

2⁸¹³⁴⁵⁵ is an apocalyptic number.

813455 is a deficient number, since it is larger than the sum of its proper divisors (162697).

813455 is a wasteful number, since it uses less digits than its factorization.

813455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162696.

The product of its digits is 2400, while the sum is 26.

The square root of 813455 is about 901.9174019831. The cubic root of 813455 is about 93.3493240742.

The spelling of 813455 in words is "eight hundred thirteen thousand, four hundred fifty-five".