340218390 has 16 divisors (see below), whose sum is σ = 816524208. Its totient is φ = 90724896.

The previous prime is 340218379. The next prime is 340218407. The reversal of 340218390 is 93812043.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 11340613 = 340218390 / (3 + 4 + 0 + 2 + 1 + 8 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5670277 + ... + 5670336.

It is an arithmetic number, because the mean of its divisors is an integer number (51032763).

Almost surely, 2^340218390 is an apocalyptic number.

340218390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

340218390 is an abundant number, since it is smaller than the sum of its proper divisors (476305818).

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

340218390 is a wasteful number, since it uses less digits than its factorization.

340218390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11340623.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 340218390 is about 18445.0098942776. The cubic root of 340218390 is about 698.1026099619.

The spelling of 340218390 in words is "three hundred forty million, two hundred eighteen thousand, three hundred ninety".