123999345 has 12 divisors (see below), whose sum is σ = 214932276. Its totient is φ = 66132960.

The previous prime is 123999341. The next prime is 123999419. The reversal of 123999345 is 543999321.

It can be written as a sum of positive squares in 2 ways, for example, as 85211361 + 38787984 = 9231^2 + 6228^2 .

It is not a de Polignac number, because 123999345 - 2² = 123999341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2755541 = 123999345 / (1 + 2 + 3 + 9 + 9 + 9 + 3 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 123999345.

It is not an unprimeable number, because it can be changed into a prime (123999341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1377726 + ... + 1377815.

It is an arithmetic number, because the mean of its divisors is an integer number (17911023).

Almost surely, 2^123999345 is an apocalyptic number.

123999345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123999345 is a deficient number, since it is larger than the sum of its proper divisors (90932931).

123999345 is a wasteful number, since it uses less digits than its factorization.

123999345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755552 (or 2755549 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 123999345 is about 11135.4993152530. The cubic root of 123999345 is about 498.6622171999.

The spelling of 123999345 in words is "one hundred twenty-three million, nine hundred ninety-nine thousand, three hundred forty-five".