1138423820 has 12 divisors (see below), whose sum is σ = 2390690064. Its totient is φ = 455369520.

The previous prime is 1138423813. The next prime is 1138423843. The reversal of 1138423820 is 283248311.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28460576 + ... + 28460615.

It is an arithmetic number, because the mean of its divisors is an integer number (199224172).

Almost surely, 2^1138423820 is an apocalyptic number.

1138423820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138423820 is an abundant number, since it is smaller than the sum of its proper divisors (1252266244).

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

1138423820 is a wasteful number, since it uses less digits than its factorization.

1138423820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56921200 (or 56921198 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1138423820 is about 33740.5367473607. The cubic root of 1138423820 is about 1044.1622583152.

The spelling of 1138423820 in words is "one billion, one hundred thirty-eight million, four hundred twenty-three thousand, eight hundred twenty".