123256742 has 16 divisors (see below), whose sum is σ = 216451872. Its totient is φ = 51535680.

The previous prime is 123256703. The next prime is 123256801. The reversal of 123256742 is 247652321.

It is a junction number, because it is equal to n+sod(n) for n = 123256699 and 123256708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106793 + ... + 107940.

It is an arithmetic number, because the mean of its divisors is an integer number (13528242).

Almost surely, 2^123256742 is an apocalyptic number.

123256742 is a deficient number, since it is larger than the sum of its proper divisors (93195130).

123256742 is a wasteful number, since it uses less digits than its factorization.

123256742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214783.

The product of its digits is 20160, while the sum is 32.

The square root of 123256742 is about 11102.1052958437. The cubic root of 123256742 is about 497.6647663473.

The spelling of 123256742 in words is "one hundred twenty-three million, two hundred fifty-six thousand, seven hundred forty-two".