123401657 has 4 divisors (see below), whose sum is σ = 130660596. Its totient is φ = 116142720.

The previous prime is 123401633. The next prime is 123401659. The reversal of 123401657 is 756104321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49716601 + 73685056 = 7051^2 + 8584^2 .

It is a cyclic number.

It is not a de Polignac number, because 123401657 - 2²⁰ = 122353081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123401659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3629444 + ... + 3629477.

It is an arithmetic number, because the mean of its divisors is an integer number (32665149).

Almost surely, 2^123401657 is an apocalyptic number.

123401657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

123401657 is a deficient number, since it is larger than the sum of its proper divisors (7258939).

123401657 is an equidigital number, since it uses as much as digits as its factorization.

123401657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7258938.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 123401657 is about 11108.6298435046. The cubic root of 123401657 is about 497.8597275397.

Adding to 123401657 its reverse (756104321), we get a palindrome (879505978).

The spelling of 123401657 in words is "one hundred twenty-three million, four hundred one thousand, six hundred fifty-seven".