813387 has 4 divisors (see below), whose sum is σ = 1084520. Its totient is φ = 542256.

The previous prime is 813383. The next prime is 813401. The reversal of 813387 is 783318.

813387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 813387 - 2² = 813383 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135562 + ... + 135567.

It is an arithmetic number, because the mean of its divisors is an integer number (271130).

2⁸¹³³⁸⁷ is an apocalyptic number.

813387 is a deficient number, since it is larger than the sum of its proper divisors (271133).

813387 is a wasteful number, since it uses less digits than its factorization.

813387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271132.

The product of its digits is 4032, while the sum is 30.

The square root of 813387 is about 901.8797037299. The cubic root of 813387 is about 93.3467228523.

The spelling of 813387 in words is "eight hundred thirteen thousand, three hundred eighty-seven".