18723742 has 8 divisors (see below), whose sum is σ = 28114632. Its totient is φ = 9352200.

The previous prime is 18723703. The next prime is 18723743. The reversal of 18723742 is 24732781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18723698 and 18723707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723743) 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, 2109 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (3514329).

Almost surely, 2^18723742 is an apocalyptic number.

18723742 is a deficient number, since it is larger than the sum of its proper divisors (9390890).

18723742 is a wasteful number, since it uses less digits than its factorization.

18723742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9674.

The product of its digits is 18816, while the sum is 34.

The square root of 18723742 is about 4327.0939439767. The cubic root of 18723742 is about 265.5405697430.

The spelling of 18723742 in words is "eighteen million, seven hundred twenty-three thousand, seven hundred forty-two".