340804397 has 4 divisors (see below), whose sum is σ = 340852380. Its totient is φ = 340756416.

The previous prime is 340804367. The next prime is 340804417. The reversal of 340804397 is 793408043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793408043 = 2129 ⋅372667.

It can be written as a sum of positive squares in 2 ways, for example, as 184579396 + 156225001 = 13586^2 + 12499^2 .

It is a cyclic number.

It is not a de Polignac number, because 340804397 - 2⁶ = 340804333 is a prime.

It is a super-2 number, since 2×340804397² = 232295274029067218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340804397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340804307) 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 3 ways as a sum of consecutive naturals, for example, 10988 + ... + 28325.

It is an arithmetic number, because the mean of its divisors is an integer number (85213095).

Almost surely, 2^340804397 is an apocalyptic number.

It is an amenable number.

340804397 is a deficient number, since it is larger than the sum of its proper divisors (47983).

340804397 is an equidigital number, since it uses as much as digits as its factorization.

340804397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47982.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 340804397 is about 18460.8883047377. Note that the first 3 decimals coincide. The cubic root of 340804397 is about 698.5031941874.

The spelling of 340804397 in words is "three hundred forty million, eight hundred four thousand, three hundred ninety-seven".