840155328 has 140 divisors (see below), whose sum is σ = 2549077960. Its totient is φ = 273466368.

The previous prime is 840155291. The next prime is 840155347. The reversal of 840155328 is 823551048.

It is a happy number.

840155328 is a `hidden beast` number, since 84 + 0 + 1 + 553 + 28 = 666.

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 = 840155292 and 840155301.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 221028 + ... + 224796.

Almost surely, 2^840155328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840155328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1274538980).

840155328 is an abundant number, since it is smaller than the sum of its proper divisors (1708922632).

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

840155328 is a wasteful number, since it uses less digits than its factorization.

840155328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836 (or 3817 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 840155328 is about 28985.4330310934. The cubic root of 840155328 is about 943.5969504131.

The spelling of 840155328 in words is "eight hundred forty million, one hundred fifty-five thousand, three hundred twenty-eight".