340778047 has 4 divisors (see below), whose sum is σ = 343265616. Its totient is φ = 338290480.

The previous prime is 340778023. The next prime is 340778161. The reversal of 340778047 is 740877043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 740877043 = 103 ⋅7192981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340778047 is a prime.

It is a super-3 number, since 3×340778047³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340773047) 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, 1243579 + ... + 1243852.

It is an arithmetic number, because the mean of its divisors is an integer number (85816404).

Almost surely, 2^340778047 is an apocalyptic number.

340778047 is a deficient number, since it is larger than the sum of its proper divisors (2487569).

340778047 is a wasteful number, since it uses less digits than its factorization.

340778047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487568.

The product of its (nonzero) digits is 131712, while the sum is 40.

The square root of 340778047 is about 18460.1746199758. The cubic root of 340778047 is about 698.4851916482.

It can be divided in two parts, 34077 and 8047, that added together give a palindrome (42124).

The spelling of 340778047 in words is "three hundred forty million, seven hundred seventy-eight thousand, forty-seven".