1122120405 has 32 divisors (see below), whose sum is σ = 2279865600. Its totient is φ = 512968896.

The previous prime is 1122120401. The next prime is 1122120427. The reversal of 1122120405 is 5040212211.

It is not a de Polignac number, because 1122120405 - 2² = 1122120401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122120401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 592770 + ... + 594659.

It is an arithmetic number, because the mean of its divisors is an integer number (71245800).

Almost surely, 2^1122120405 is an apocalyptic number.

1122120405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1122120405 is an abundant number, since it is smaller than the sum of its proper divisors (1157745195).

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

1122120405 is a wasteful number, since it uses less digits than its factorization.

1122120405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187450 (or 1187444 counting only the distinct ones).

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

The square root of 1122120405 is about 33498.0656904246. The cubic root of 1122120405 is about 1039.1537756989.

Adding to 1122120405 its reverse (5040212211), we get a palindrome (6162332616).

It can be divided in two parts, 11221 and 20405, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 1122120405 in words is "one billion, one hundred twenty-two million, one hundred twenty thousand, four hundred five".