1212343457 has 16 divisors (see below), whose sum is σ = 1387607760. Its totient is φ = 1049290752.

The previous prime is 1212343421. The next prime is 1212343459. The reversal of 1212343457 is 7543432121.

It can be written as a sum of positive squares in 8 ways, for example, as 99520576 + 1112822881 = 9976^2 + 33359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212343457 - 2¹⁰ = 1212342433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212343459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49253 + ... + 69645.

It is an arithmetic number, because the mean of its divisors is an integer number (86725485).

Almost surely, 2^1212343457 is an apocalyptic number.

1212343457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1212343457 is a deficient number, since it is larger than the sum of its proper divisors (175264303).

1212343457 is a wasteful number, since it uses less digits than its factorization.

1212343457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20692.

The product of its digits is 20160, while the sum is 32.

The square root of 1212343457 is about 34818.7227939222. The cubic root of 1212343457 is about 1066.2897250901.

Adding to 1212343457 its reverse (7543432121), we get a palindrome (8755775578).

The spelling of 1212343457 in words is "one billion, two hundred twelve million, three hundred forty-three thousand, four hundred fifty-seven".