823144940 has 12 divisors (see below), whose sum is σ = 1728604416. Its totient is φ = 329257968.

The previous prime is 823144921. The next prime is 823144943. The reversal of 823144940 is 49441328.

It is a self number, because there is not a number n which added to its sum of digits gives 823144940.

It is not an unprimeable number, because it can be changed into a prime (823144943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20578604 + ... + 20578643.

It is an arithmetic number, because the mean of its divisors is an integer number (144050368).

Almost surely, 2^823144940 is an apocalyptic number.

It is an amenable number.

823144940 is an abundant number, since it is smaller than the sum of its proper divisors (905459476).

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

823144940 is a wasteful number, since it uses less digits than its factorization.

823144940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41157256 (or 41157254 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 823144940 is about 28690.5026097488. The cubic root of 823144940 is about 937.1852345368.

The spelling of 823144940 in words is "eight hundred twenty-three million, one hundred forty-four thousand, nine hundred forty".