840632836 has 6 divisors (see below), whose sum is σ = 1471107470. Its totient is φ = 420316416.

The previous prime is 840632809. The next prime is 840632839. The reversal of 840632836 is 638236048.

It can be written as a sum of positive squares in only one way, i.e., 736796736 + 103836100 = 27144^2 + 10190^2 .

It is a super-2 number, since 2×840632836² = 1413327129922805792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (840632839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105079101 + ... + 105079108.

Almost surely, 2^840632836 is an apocalyptic number.

It is an amenable number.

840632836 is a deficient number, since it is larger than the sum of its proper divisors (630474634).

840632836 is a wasteful number, since it uses less digits than its factorization.

840632836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210158213 (or 210158211 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 840632836 is about 28993.6688951226. The cubic root of 840632836 is about 943.7756831395.

The spelling of 840632836 in words is "eight hundred forty million, six hundred thirty-two thousand, eight hundred thirty-six".