340638 has 8 divisors (see below), whose sum is σ = 681288. Its totient is φ = 113544.

The previous prime is 340633. The next prime is 340643. The reversal of 340638 is 836043.

It is an interprime number because it is at equal distance from previous prime (340633) and next prime (340643).

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

340638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340633) 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, 28381 + ... + 28392.

It is an arithmetic number, because the mean of its divisors is an integer number (85161).

2³⁴⁰⁶³⁸ is an apocalyptic number.

340638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

340638 is a wasteful number, since it uses less digits than its factorization.

340638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56778.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 340638 is about 583.6420135665. The cubic root of 340638 is about 69.8389494796.

The spelling of 340638 in words is "three hundred forty thousand, six hundred thirty-eight".