340820406 has 32 divisors (see below), whose sum is σ = 773498880. Its totient is φ = 111188808.

The previous prime is 340820387. The next prime is 340820407. The reversal of 340820406 is 604028043.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 340820406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340820407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64606 + ... + 69681.

It is an arithmetic number, because the mean of its divisors is an integer number (24171840).

Almost surely, 2^340820406 is an apocalyptic number.

340820406 is an abundant number, since it is smaller than the sum of its proper divisors (432678474).

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

340820406 is a wasteful number, since it uses less digits than its factorization.

340820406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134345 (or 134339 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 340820406 is about 18461.3218919990. The cubic root of 340820406 is about 698.5141312162.

Adding to 340820406 its reverse (604028043), we get a palindrome (944848449).

The spelling of 340820406 in words is "three hundred forty million, eight hundred twenty thousand, four hundred six".