834378139 has 16 divisors (see below), whose sum is σ = 1012359168. Its totient is φ = 671317632.

The previous prime is 834378137. The next prime is 834378161. The reversal of 834378139 is 931873438.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 834378139 - 2¹ = 834378137 is a prime.

It is a super-2 number, since 2×834378139² = 1392373757682206642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (834378137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36424 + ... + 54730.

It is an arithmetic number, because the mean of its divisors is an integer number (63272448).

Almost surely, 2^834378139 is an apocalyptic number.

834378139 is a deficient number, since it is larger than the sum of its proper divisors (177981029).

834378139 is a wasteful number, since it uses less digits than its factorization.

834378139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18714.

The product of its digits is 435456, while the sum is 46.

The square root of 834378139 is about 28885.6043558033. The cubic root of 834378139 is about 941.4291445452.

The spelling of 834378139 in words is "eight hundred thirty-four million, three hundred seventy-eight thousand, one hundred thirty-nine".