123906742 has 4 divisors (see below), whose sum is σ = 185860116. Its totient is φ = 61953370.

The previous prime is 123906709. The next prime is 123906767. The reversal of 123906742 is 247609321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247609321 = 3911 ⋅63311.

It is a junction number, because it is equal to n+sod(n) for n = 123906698 and 123906707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30976684 + ... + 30976687.

It is an arithmetic number, because the mean of its divisors is an integer number (46465029).

Almost surely, 2^123906742 is an apocalyptic number.

123906742 is a deficient number, since it is larger than the sum of its proper divisors (61953374).

123906742 is an equidigital number, since it uses as much as digits as its factorization.

123906742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61953373.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 123906742 is about 11131.3405302326. The cubic root of 123906742 is about 498.5380522504.

The spelling of 123906742 in words is "one hundred twenty-three million, nine hundred six thousand, seven hundred forty-two".