123012345 has 32 divisors (see below), whose sum is σ = 207100800. Its totient is φ = 62257664.

The previous prime is 123012343. The next prime is 123012347. The reversal of 123012345 is 543210321.

It is an interprime number because it is at equal distance from previous prime (123012343) and next prime (123012347).

It is not a de Polignac number, because 123012345 - 2¹ = 123012343 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 (123012343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23269 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (6471900).

Almost surely, 2^123012345 is an apocalyptic number.

123012345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123012345 is a deficient number, since it is larger than the sum of its proper divisors (84088455).

123012345 is a wasteful number, since it uses less digits than its factorization.

123012345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 123012345 is about 11091.0930480273. The cubic root of 123012345 is about 497.3356207184.

Adding to 123012345 its reverse (543210321), we get a palindrome (666222666).

The spelling of 123012345 in words is "one hundred twenty-three million, twelve thousand, three hundred forty-five".