340891638 has 8 divisors (see below), whose sum is σ = 681783288. Its totient is φ = 113630544.

The previous prime is 340891637. The next prime is 340891669. The reversal of 340891638 is 836198043.

It is a happy number.

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

340891638 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 340891638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340891631) 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, 28407631 + ... + 28407642.

It is an arithmetic number, because the mean of its divisors is an integer number (85222911).

Almost surely, 2^340891638 is an apocalyptic number.

340891638 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.

340891638 is a wasteful number, since it uses less digits than its factorization.

340891638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56815278.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 340891638 is about 18463.2510138383. The cubic root of 340891638 is about 698.5627913431.

The spelling of 340891638 in words is "three hundred forty million, eight hundred ninety-one thousand, six hundred thirty-eight".