1004656840 has 64 divisors (see below), whose sum is σ = 2475178560. Its totient is φ = 363966720.

The previous prime is 1004656811. The next prime is 1004656843. The reversal of 1004656840 is 486564001.

It is a junction number, because it is equal to n+sod(n) for n = 1004656796 and 1004656805.

It is not an unprimeable number, because it can be changed into a prime (1004656843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117759 + ... + 126001.

It is an arithmetic number, because the mean of its divisors is an integer number (38674665).

Almost surely, 2^1004656840 is an apocalyptic number.

1004656840 is a gapful number since it is divisible by the number (10) 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 1004656840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237589280).

1004656840 is an abundant number, since it is smaller than the sum of its proper divisors (1470521720).

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

1004656840 is a wasteful number, since it uses less digits than its factorization.

1004656840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542 (or 8538 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1004656840 is about 31696.3221841273. The cubic root of 1004656840 is about 1001.5498766414.

The spelling of 1004656840 in words is "one billion, four million, six hundred fifty-six thousand, eight hundred forty".