340781 has 8 divisors (see below), whose sum is σ = 394560. Its totient is φ = 288288.

The previous prime is 340777. The next prime is 340787. The reversal of 340781 is 187043.

It is a happy number.

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

It is not a de Polignac number, because 340781 - 2² = 340777 is a prime.

It is a super-2 number, since 2×340781² = 232263379922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (49320).

2³⁴⁰⁷⁸¹ is an apocalyptic number.

It is an amenable number.

340781 is a deficient number, since it is larger than the sum of its proper divisors (53779).

340781 is an equidigital number, since it uses as much as digits as its factorization.

340781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 340781 is about 583.7645073144. The cubic root of 340781 is about 69.8487209209.

The spelling of 340781 in words is "three hundred forty thousand, seven hundred eighty-one".