340278813 has 80 divisors (see below), whose sum is σ = 614718720. Its totient is φ = 183389184.

The previous prime is 340278787. The next prime is 340278857. The reversal of 340278813 is 318872043.

It is not a de Polignac number, because 340278813 - 2⁵ = 340278781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340278013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1264843 + ... + 1265111.

It is an arithmetic number, because the mean of its divisors is an integer number (7683984).

Almost surely, 2^340278813 is an apocalyptic number.

It is an amenable number.

340278813 is a deficient number, since it is larger than the sum of its proper divisors (274439907).

340278813 is a wasteful number, since it uses less digits than its factorization.

340278813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 340278813 is about 18446.6477442380. The cubic root of 340278813 is about 698.1439353363.

It can be divided in two parts, 3402 and 78813, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 340278813 in words is "three hundred forty million, two hundred seventy-eight thousand, eight hundred thirteen".