840227840 has 88 divisors (see below), whose sum is σ = 2025547440. Its totient is φ = 334430208.

The previous prime is 840227831. The next prime is 840227851. The reversal of 840227840 is 48722048.

It is a super-2 number, since 2×840227840² = 1411965646222131200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 840227840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940264 + ... + 1940696.

Almost surely, 2^840227840 is an apocalyptic number.

840227840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840227840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012773720).

840227840 is an abundant number, since it is smaller than the sum of its proper divisors (1185319600).

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

840227840 is a wasteful number, since it uses less digits than its factorization.

840227840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 840227840 is about 28986.6838393080. The cubic root of 840227840 is about 943.6240962402.

Adding to 840227840 its reverse (48722048), we get a palindrome (888949888).

The spelling of 840227840 in words is "eight hundred forty million, two hundred twenty-seven thousand, eight hundred forty".