840134399 has 8 divisors (see below), whose sum is σ = 908368272. Its totient is φ = 772416000.

The previous prime is 840134389. The next prime is 840134411. The reversal of 840134399 is 993431048.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840134399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840134359) 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 7 ways as a sum of consecutive naturals, for example, 125474 + ... + 131999.

It is an arithmetic number, because the mean of its divisors is an integer number (113546034).

Almost surely, 2^840134399 is an apocalyptic number.

840134399 is a deficient number, since it is larger than the sum of its proper divisors (68233873).

840134399 is a wasteful number, since it uses less digits than its factorization.

840134399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257737.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 840134399 is about 28985.0720026706. The cubic root of 840134399 is about 943.5891150744.

The spelling of 840134399 in words is "eight hundred forty million, one hundred thirty-four thousand, three hundred ninety-nine".