123240742 has 4 divisors (see below), whose sum is σ = 184861116. Its totient is φ = 61620370.

The previous prime is 123240713. The next prime is 123240757. The reversal of 123240742 is 247042321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247042321 = 3691 ⋅66931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810184 + ... + 30810187.

It is an arithmetic number, because the mean of its divisors is an integer number (46215279).

Almost surely, 2^123240742 is an apocalyptic number.

123240742 is a deficient number, since it is larger than the sum of its proper divisors (61620374).

123240742 is an equidigital number, since it uses as much as digits as its factorization.

123240742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61620373.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 123240742 is about 11101.3846884071. The cubic root of 123240742 is about 497.6432314040.

The spelling of 123240742 in words is "one hundred twenty-three million, two hundred forty thousand, seven hundred forty-two".