340005905 has 16 divisors (see below), whose sum is σ = 415050240. Its totient is φ = 267328512.

The previous prime is 340005881. The next prime is 340005929. The reversal of 340005905 is 509500043.

It is an interprime number because it is at equal distance from previous prime (340005881) and next prime (340005929).

It is a cyclic number.

It is not a de Polignac number, because 340005905 - 2¹⁰ = 340004881 is a prime.

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, 192416 + ... + 194174.

It is an arithmetic number, because the mean of its divisors is an integer number (25940640).

Almost surely, 2^340005905 is an apocalyptic number.

It is an amenable number.

340005905 is a deficient number, since it is larger than the sum of its proper divisors (75044335).

340005905 is a wasteful number, since it uses less digits than its factorization.

340005905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 340005905 is about 18439.2490356847. The cubic root of 340005905 is about 697.9572452691.

Adding to 340005905 its reverse (509500043), we get a palindrome (849505948).

The spelling of 340005905 in words is "three hundred forty million, five thousand, nine hundred five".