340217991 has 24 divisors (see below), whose sum is σ = 524163744. Its totient is φ = 211898880.

The previous prime is 340217953. The next prime is 340218017. The reversal of 340217991 is 199712043.

It is not a de Polignac number, because 340217991 - 2¹¹ = 340215943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340217951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12846 + ... + 29076.

It is an arithmetic number, because the mean of its divisors is an integer number (21840156).

Almost surely, 2^340217991 is an apocalyptic number.

340217991 is a deficient number, since it is larger than the sum of its proper divisors (183945753).

340217991 is a wasteful number, since it uses less digits than its factorization.

340217991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391 (or 16388 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 340217991 is about 18444.9990783410. Note that the first 3 decimals coincide. The cubic root of 340217991 is about 698.1023370558.

The spelling of 340217991 in words is "three hundred forty million, two hundred seventeen thousand, nine hundred ninety-one".