1121405004 has 36 divisors (see below), whose sum is σ = 2983857240. Its totient is φ = 354127680.

The previous prime is 1121405003. The next prime is 1121405009. The reversal of 1121405004 is 4005041211.

1121405004 is a `hidden beast` number, since 1 + 121 + 40 + 500 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1121405003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 819057 + ... + 820424.

Almost surely, 2^1121405004 is an apocalyptic number.

It is an amenable number.

1121405004 is an abundant number, since it is smaller than the sum of its proper divisors (1862452236).

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

1121405004 is a wasteful number, since it uses less digits than its factorization.

1121405004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639510 (or 1639505 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1121405004 is about 33487.3857444859. The cubic root of 1121405004 is about 1038.9328933739.

Adding to 1121405004 its reverse (4005041211), we get a palindrome (5126446215).

The spelling of 1121405004 in words is "one billion, one hundred twenty-one million, four hundred five thousand, four".