396781 has 8 divisors (see below), whose sum is σ = 494784. Its totient is φ = 309120.

The previous prime is 396733. The next prime is 396833. The reversal of 396781 is 187693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 396781 - 2⁹ = 396269 is a prime.

It is a super-2 number, since 2×396781² = 314870323922, which contains 22 as substring.

It is a Duffinian number.

396781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396181) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2500 + ... + 2653.

It is an arithmetic number, because the mean of its divisors is an integer number (61848).

2³⁹⁶⁷⁸¹ is an apocalyptic number.

It is an amenable number.

396781 is a deficient number, since it is larger than the sum of its proper divisors (98003).

396781 is a wasteful number, since it uses less digits than its factorization.

396781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171.

The product of its digits is 9072, while the sum is 34.

The square root of 396781 is about 629.9055484753. The cubic root of 396781 is about 73.4824491082.

The spelling of 396781 in words is "three hundred ninety-six thousand, seven hundred eighty-one".