340386640 has 80 divisors (see below), whose sum is σ = 866123136. Its totient is φ = 123379200.

The previous prime is 340386619. The next prime is 340386661. The reversal of 340386640 is 46683043.

It is an interprime number because it is at equal distance from previous prime (340386619) and next prime (340386661).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 340386596 and 340386605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539125 + ... + 539755.

Almost surely, 2^340386640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 340386640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433061568).

340386640 is an abundant number, since it is smaller than the sum of its proper divisors (525736496).

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

340386640 is a wasteful number, since it uses less digits than its factorization.

340386640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 340386640 is about 18449.5701846954. The cubic root of 340386640 is about 698.2176697890.

The spelling of 340386640 in words is "three hundred forty million, three hundred eighty-six thousand, six hundred forty".