123399657 has 12 divisors (see below), whose sum is σ = 180247860. Its totient is φ = 81341568.

The previous prime is 123399649. The next prime is 123399667. The reversal of 123399657 is 756993321.

It can be written as a sum of positive squares in 2 ways, for example, as 29387241 + 94012416 = 5421^2 + 9696^2 .

It is not a de Polignac number, because 123399657 - 2³ = 123399649 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (123399607) 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, 76228 + ... + 77829.

It is an arithmetic number, because the mean of its divisors is an integer number (15020655).

Almost surely, 2^123399657 is an apocalyptic number.

It is an amenable number.

123399657 is a deficient number, since it is larger than the sum of its proper divisors (56848203).

123399657 is a wasteful number, since it uses less digits than its factorization.

123399657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154152 (or 154149 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 123399657 is about 11108.5398230370. The cubic root of 123399657 is about 497.8570378815.

The spelling of 123399657 in words is "one hundred twenty-three million, three hundred ninety-nine thousand, six hundred fifty-seven".