1212340445 has 4 divisors (see below), whose sum is σ = 1454808540. Its totient is φ = 969872352.

The previous prime is 1212340433. The next prime is 1212340453. The reversal of 1212340445 is 5440432121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 848789956 + 363550489 = 29134^2 + 19067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212340445 - 2¹⁶ = 1212274909 is a prime.

It is a congruent number.

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, 121234040 + ... + 121234049.

It is an arithmetic number, because the mean of its divisors is an integer number (363702135).

Almost surely, 2^1212340445 is an apocalyptic number.

It is an amenable number.

1212340445 is a deficient number, since it is larger than the sum of its proper divisors (242468095).

1212340445 is an equidigital number, since it uses as much as digits as its factorization.

1212340445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242468094.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1212340445 is about 34818.6795413037. The cubic root of 1212340445 is about 1066.2888420435.

Adding to 1212340445 its reverse (5440432121), we get a palindrome (6652772566).

The spelling of 1212340445 in words is "one billion, two hundred twelve million, three hundred forty thousand, four hundred forty-five".