1204389823 has 18 divisors (see below), whose sum is σ = 1491949224. Its totient is φ = 951979392.

The previous prime is 1204389817. The next prime is 1204389863. The reversal of 1204389823 is 3289834021.

It is not a de Polignac number, because 1204389823 - 2¹⁷ = 1204258751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204389863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1193143 + ... + 1194151.

It is an arithmetic number, because the mean of its divisors is an integer number (82886068).

Almost surely, 2^1204389823 is an apocalyptic number.

1204389823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1204389823 is a deficient number, since it is larger than the sum of its proper divisors (287559401).

1204389823 is an frugal number, since it uses more digits than its factorization.

1204389823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 1204389823 is about 34704.3199472342. The cubic root of 1204389823 is about 1063.9527931338.

The spelling of 1204389823 in words is "one billion, two hundred four million, three hundred eighty-nine thousand, eight hundred twenty-three".