123991345 has 16 divisors (see below), whose sum is σ = 151990272. Its totient is φ = 97076160.

The previous prime is 123991313. The next prime is 123991379. The reversal of 123991345 is 543199321.

It is not a de Polignac number, because 123991345 - 2⁵ = 123991313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67104 + ... + 68926.

It is an arithmetic number, because the mean of its divisors is an integer number (9499392).

Almost surely, 2^123991345 is an apocalyptic number.

It is an amenable number.

123991345 is a deficient number, since it is larger than the sum of its proper divisors (27998927).

123991345 is a wasteful number, since it uses less digits than its factorization.

123991345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112.

The product of its digits is 29160, while the sum is 37.

The square root of 123991345 is about 11135.1400979063. The cubic root of 123991345 is about 498.6514929940.

The spelling of 123991345 in words is "one hundred twenty-three million, nine hundred ninety-one thousand, three hundred forty-five".