123149428 has 48 divisors (see below), whose sum is σ = 238003920. Its totient is φ = 55494656.

The previous prime is 123149381. The next prime is 123149443. The reversal of 123149428 is 824941321.

It can be written as a sum of positive squares in 8 ways, for example, as 5253264 + 117896164 = 2292^2 + 10858^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 123149393 and 123149402.

It is a congruent 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, 388326 + ... + 388642.

It is an arithmetic number, because the mean of its divisors is an integer number (4958415).

Almost surely, 2^123149428 is an apocalyptic number.

It is an amenable number.

123149428 is a deficient number, since it is larger than the sum of its proper divisors (114854492).

123149428 is a wasteful number, since it uses less digits than its factorization.

123149428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 562 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 123149428 is about 11097.2711961094. The cubic root of 123149428 is about 497.5202931042.

The spelling of 123149428 in words is "one hundred twenty-three million, one hundred forty-nine thousand, four hundred twenty-eight".