840427128 has 48 divisors (see below), whose sum is σ = 2279729400. Its totient is φ = 279702720.

The previous prime is 840427111. The next prime is 840427129. The reversal of 840427128 is 821724048.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 840427092 and 840427101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840427129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38763 + ... + 56421.

Almost surely, 2^840427128 is an apocalyptic number.

It is an amenable number.

840427128 is an abundant number, since it is smaller than the sum of its proper divisors (1439302272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840427128 is a wasteful number, since it uses less digits than its factorization.

840427128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18332 (or 18325 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 840427128 is about 28990.1212139584. The cubic root of 840427128 is about 943.6986942973.

The spelling of 840427128 in words is "eight hundred forty million, four hundred twenty-seven thousand, one hundred twenty-eight".