123389428 has 12 divisors (see below), whose sum is σ = 216040132. Its totient is φ = 61663680.

The previous prime is 123389407. The next prime is 123389449. The reversal of 123389428 is 824983321.

It is an interprime number because it is at equal distance from previous prime (123389407) and next prime (123389449).

It can be written as a sum of positive squares in 2 ways, for example, as 80066704 + 43322724 = 8948^2 + 6582^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776 + ... + 15952.

Almost surely, 2^123389428 is an apocalyptic number.

It is an amenable number.

123389428 is a deficient number, since it is larger than the sum of its proper divisors (92650704).

123389428 is a wasteful number, since it uses less digits than its factorization.

123389428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15522 (or 15520 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 123389428 is about 11108.0794019488. The cubic root of 123389428 is about 497.8432811702.

The spelling of 123389428 in words is "one hundred twenty-three million, three hundred eighty-nine thousand, four hundred twenty-eight".