1212323405 has 16 divisors (see below), whose sum is σ = 1563943680. Its totient is φ = 899260992.

The previous prime is 1212323401. The next prime is 1212323407. The reversal of 1212323405 is 5043232121.

It is a cyclic number.

It is not a de Polignac number, because 1212323405 - 2² = 1212323401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212323401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131294 + ... + 140223.

It is an arithmetic number, because the mean of its divisors is an integer number (97746480).

Almost surely, 2^1212323405 is an apocalyptic number.

It is an amenable number.

1212323405 is a deficient number, since it is larger than the sum of its proper divisors (351620275).

1212323405 is a wasteful number, since it uses less digits than its factorization.

1212323405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271588.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1212323405 is about 34818.4348442029. The cubic root of 1212323405 is about 1066.2838462942.

Adding to 1212323405 its reverse (5043232121), we get a palindrome (6255555526).

The spelling of 1212323405 in words is "one billion, two hundred twelve million, three hundred twenty-three thousand, four hundred five".