18723470 has 16 divisors (see below), whose sum is σ = 34525008. Its totient is φ = 7306560.

The previous prime is 18723461. The next prime is 18723487. The reversal of 18723470 is 7432781.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22424 + ... + 23243.

It is an arithmetic number, because the mean of its divisors is an integer number (2157813).

Almost surely, 2^18723470 is an apocalyptic number.

18723470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18723470 is a deficient number, since it is larger than the sum of its proper divisors (15801538).

18723470 is a wasteful number, since it uses less digits than its factorization.

18723470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45715.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 18723470 is about 4327.0625139926. The cubic root of 18723470 is about 265.5392838998.

The spelling of 18723470 in words is "eighteen million, seven hundred twenty-three thousand, four hundred seventy".