340217990 has 32 divisors (see below), whose sum is σ = 736715520. Its totient is φ = 110506464.

The previous prime is 340217953. The next prime is 340218017. The reversal of 340217990 is 99712043.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 340217990.

It is a congruent number.

It is an unprimeable number.

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, 126572 + ... + 129231.

It is an arithmetic number, because the mean of its divisors is an integer number (23022360).

Almost surely, 2^340217990 is an apocalyptic number.

340217990 is an abundant number, since it is smaller than the sum of its proper divisors (396497530).

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

340217990 is a wasteful number, since it uses less digits than its factorization.

340217990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255836.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 340217990 is about 18444.9990512334. Note that the first 3 decimals coincide. The cubic root of 340217990 is about 698.1023363718.

Adding to 340217990 its sum of digits (35), we get a square (340218025 = 18445²).

The spelling of 340217990 in words is "three hundred forty million, two hundred seventeen thousand, nine hundred ninety".