123949945 has 16 divisors (see below), whose sum is σ = 170748288. Its totient is φ = 84614400.

The previous prime is 123949937. The next prime is 123949961. The reversal of 123949945 is 549949321.

It is not a de Polignac number, because 123949945 - 2³ = 123949937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123949895 and 123949904.

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, 145 + ... + 15745.

It is an arithmetic number, because the mean of its divisors is an integer number (10671768).

Almost surely, 2^123949945 is an apocalyptic number.

It is an amenable number.

123949945 is a deficient number, since it is larger than the sum of its proper divisors (46798343).

123949945 is a wasteful number, since it uses less digits than its factorization.

123949945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15840.

The product of its digits is 349920, while the sum is 46.

The square root of 123949945 is about 11133.2809629507. The cubic root of 123949945 is about 498.5959878567.

The spelling of 123949945 in words is "one hundred twenty-three million, nine hundred forty-nine thousand, nine hundred forty-five".