813995 has 16 divisors (see below), whose sum is σ = 1202880. Its totient is φ = 514944.

The previous prime is 813991. The next prime is 813997. The reversal of 813995 is 599318.

813995 = 338² + 339² + ... + 344².

It is a cyclic number.

It is not a de Polignac number, because 813995 - 2² = 813991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (813991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (75180).

2⁸¹³⁹⁹⁵ is an apocalyptic number.

813995 is a deficient number, since it is larger than the sum of its proper divisors (388885).

813995 is a wasteful number, since it uses less digits than its factorization.

813995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814.

The product of its digits is 9720, while the sum is 35.

The square root of 813995 is about 902.2167145426. The cubic root of 813995 is about 93.3699756918.

The spelling of 813995 in words is "eight hundred thirteen thousand, nine hundred ninety-five".