123432345 has 48 divisors (see below), whose sum is σ = 221130000. Its totient is φ = 63651840.

The previous prime is 123432319. The next prime is 123432347. The reversal of 123432345 is 543234321.

123432345 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 8 ways, for example, as 29942784 + 93489561 = 5472^2 + 9669^2 .

It is not a de Polignac number, because 123432345 - 2¹¹ = 123430297 is a prime.

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 (123432347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 274681 + ... + 275129.

It is an arithmetic number, because the mean of its divisors is an integer number (4606875).

Almost surely, 2^123432345 is an apocalyptic number.

123432345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123432345 is a deficient number, since it is larger than the sum of its proper divisors (97697655).

123432345 is a wasteful number, since it uses less digits than its factorization.

123432345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 647 counting only the distinct ones).

The product of its digits is 8640, while the sum is 27.

The square root of 123432345 is about 11110.0110260971. The cubic root of 123432345 is about 497.9009940115.

Adding to 123432345 its reverse (543234321), we get a palindrome (666666666).

The spelling of 123432345 in words is "one hundred twenty-three million, four hundred thirty-two thousand, three hundred forty-five".