1212343456 has 12 divisors (see below), whose sum is σ = 2386801242. Its totient is φ = 606171712.

The previous prime is 1212343421. The next prime is 1212343459. The reversal of 1212343456 is 6543432121.

1212343456 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 1202979856 + 9363600 = 34684^2 + 3060^2 .

It is an alternating number because its digits alternate between odd and even.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18942835 + ... + 18942898.

Almost surely, 2^1212343456 is an apocalyptic number.

1212343456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1212343456 is a deficient number, since it is larger than the sum of its proper divisors (1174457786).

1212343456 is an equidigital number, since it uses as much as digits as its factorization.

1212343456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37885743 (or 37885735 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 1212343456 is about 34818.7227795621. The cubic root of 1212343456 is about 1066.2897247970.

Adding to 1212343456 its reverse (6543432121), we get a palindrome (7755775577).

The spelling of 1212343456 in words is "one billion, two hundred twelve million, three hundred forty-three thousand, four hundred fifty-six".