123212345 has 8 divisors (see below), whose sum is σ = 156552264. Its totient is φ = 92771584.

The previous prime is 123212293. The next prime is 123212347. The reversal of 123212345 is 543212321.

123212345 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 4 ways, for example, as 37908649 + 85303696 = 6157^2 + 9236^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123212345 - 2⁶ = 123212281 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123212345.

It is not an unprimeable number, because it can be changed into a prime (123212347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724694 + ... + 724863.

It is an arithmetic number, because the mean of its divisors is an integer number (19569033).

Almost surely, 2^123212345 is an apocalyptic number.

It is an amenable number.

123212345 is a deficient number, since it is larger than the sum of its proper divisors (33339919).

123212345 is a wasteful number, since it uses less digits than its factorization.

123212345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449579.

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

The square root of 123212345 is about 11100.1056301280. The cubic root of 123212345 is about 497.6050063275.

Adding to 123212345 its reverse (543212321), we get a palindrome (666424666).

The spelling of 123212345 in words is "one hundred twenty-three million, two hundred twelve thousand, three hundred forty-five".