1123839405 has 48 divisors (see below), whose sum is σ = 2102209200. Its totient is φ = 552121344.

The previous prime is 1123839361. The next prime is 1123839413. The reversal of 1123839405 is 5049383211.

1123839405 is a `hidden beast` number, since 11 + 238 + 3 + 9 + 405 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 651168324 + 472671081 = 25518^2 + 21741^2 .

It is not a de Polignac number, because 1123839405 - 2⁹ = 1123838893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1123839405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 324121 + ... + 327569.

It is an arithmetic number, because the mean of its divisors is an integer number (43796025).

Almost surely, 2^1123839405 is an apocalyptic number.

1123839405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1123839405 is a deficient number, since it is larger than the sum of its proper divisors (978369795).

1123839405 is a wasteful number, since it uses less digits than its factorization.

1123839405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030 (or 4027 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1123839405 is about 33523.7140692973. The cubic root of 1123839405 is about 1039.6841388543.

The spelling of 1123839405 in words is "one billion, one hundred twenty-three million, eight hundred thirty-nine thousand, four hundred five".