334689391 has 4 divisors (see below), whose sum is σ = 334730992. Its totient is φ = 334647792.

The previous prime is 334689379. The next prime is 334689403. The reversal of 334689391 is 193986433.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 193986433 = 263 ⋅737591.

It is an interprime number because it is at equal distance from previous prime (334689379) and next prime (334689403).

It is a cyclic number.

It is not a de Polignac number, because 334689391 - 2⁷ = 334689263 is a prime.

It is a super-4 number, since 4×334689391⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (334689331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4446 + ... + 26251.

It is an arithmetic number, because the mean of its divisors is an integer number (83682748).

Almost surely, 2^334689391 is an apocalyptic number.

334689391 is a deficient number, since it is larger than the sum of its proper divisors (41601).

334689391 is a wasteful number, since it uses less digits than its factorization.

334689391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41600.

The product of its digits is 419904, while the sum is 46.

The square root of 334689391 is about 18294.5180586973. The cubic root of 334689391 is about 694.3002400796.

It can be divided in two parts, 334 and 689391, that added together give a triangular number (689725 = T₁₁₇₄).

The spelling of 334689391 in words is "three hundred thirty-four million, six hundred eighty-nine thousand, three hundred ninety-one".