802391 has 4 divisors (see below), whose sum is σ = 806784. Its totient is φ = 798000.

The previous prime is 802387. The next prime is 802421. The reversal of 802391 is 193208.

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

It is a cyclic number.

It is not a de Polignac number, because 802391 - 2² = 802387 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 802391.

It is not an unprimeable number, because it can be changed into a prime (802331) 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, 1910 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (201696).

2⁸⁰²³⁹¹ is an apocalyptic number.

802391 is a deficient number, since it is larger than the sum of its proper divisors (4393).

802391 is a wasteful number, since it uses less digits than its factorization.

802391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 802391 is about 895.7628034251. The cubic root of 802391 is about 92.9241683456.

Adding to 802391 its reverse (193208), we get a palindrome (995599).

The spelling of 802391 in words is "eight hundred two thousand, three hundred ninety-one".