840004530 has 16 divisors (see below), whose sum is σ = 2016010944. Its totient is φ = 224001200.

The previous prime is 840004513. The next prime is 840004531. The reversal of 840004530 is 35400048.

It is a happy number.

It is a super-2 number, since 2×840004530² = 1411215220841041800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840004530.

It is not an unprimeable number, because it can be changed into a prime (840004531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14000046 + ... + 14000105.

It is an arithmetic number, because the mean of its divisors is an integer number (126000684).

Almost surely, 2^840004530 is an apocalyptic number.

840004530 is an abundant number, since it is smaller than the sum of its proper divisors (1176006414).

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

840004530 is a wasteful number, since it uses less digits than its factorization.

840004530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28000161.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 840004530 is about 28982.8316421981. The cubic root of 840004530 is about 943.5404921836.

Adding to 840004530 its reverse (35400048), we get a palindrome (875404578).

The spelling of 840004530 in words is "eight hundred forty million, four thousand, five hundred thirty".