123400157 has 2 divisors, whose sum is σ = 123400158. Its totient is φ = 123400156.

The previous prime is 123400111. The next prime is 123400163. The reversal of 123400157 is 751004321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97042201 + 26357956 = 9851^2 + 5134^2 .

It is an emirp because it is prime and its reverse (751004321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123400157 - 2¹⁸ = 123138013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123400177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61700078 + 61700079.

It is an arithmetic number, because the mean of its divisors is an integer number (61700079).

Almost surely, 2^123400157 is an apocalyptic number.

It is an amenable number.

123400157 is a deficient number, since it is larger than the sum of its proper divisors (1).

123400157 is an equidigital number, since it uses as much as digits as its factorization.

123400157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 123400157 is about 11108.5623282223. The cubic root of 123400157 is about 497.8577102988.

Adding to 123400157 its reverse (751004321), we get a palindrome (874404478).

The spelling of 123400157 in words is "one hundred twenty-three million, four hundred thousand, one hundred fifty-seven".