810233940 has 96 divisors (see below), whose sum is σ = 2453359104. Its totient is φ = 199014400.

The previous prime is 810233939. The next prime is 810233953. The reversal of 810233940 is 49332018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 810233898 and 810233907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39490 + ... + 56390.

It is an arithmetic number, because the mean of its divisors is an integer number (25555824).

Almost surely, 2^810233940 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 810233940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1226679552).

810233940 is an abundant number, since it is smaller than the sum of its proper divisors (1643125164).

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

810233940 is a wasteful number, since it uses less digits than its factorization.

810233940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16977 (or 16975 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 810233940 is about 28464.6085516734. The cubic root of 810233940 is about 932.2594846261.

Adding to 810233940 its reverse (49332018), we get a palindrome (859565958).

The spelling of 810233940 in words is "eight hundred ten million, two hundred thirty-three thousand, nine hundred forty".