340391409 has 4 divisors (see below), whose sum is σ = 453855216. Its totient is φ = 226927604.

The previous prime is 340391393. The next prime is 340391411. The reversal of 340391409 is 904193043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 340391409 - 2⁴ = 340391393 is a prime.

It is a super-2 number, since 2×340391409² = 231732622642010562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 340391409.

It is not an unprimeable number, because it can be changed into a prime (340391449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56731899 + ... + 56731904.

It is an arithmetic number, because the mean of its divisors is an integer number (113463804).

Almost surely, 2^340391409 is an apocalyptic number.

It is an amenable number.

340391409 is a deficient number, since it is larger than the sum of its proper divisors (113463807).

340391409 is a wasteful number, since it uses less digits than its factorization.

340391409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113463806.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 340391409 is about 18449.6994284460. The cubic root of 340391409 is about 698.2209305756.

The spelling of 340391409 in words is "three hundred forty million, three hundred ninety-one thousand, four hundred nine".