18747423 has 8 divisors (see below), whose sum is σ = 27774000. Its totient is φ = 12498264.

The previous prime is 18747409. The next prime is 18747439. The reversal of 18747423 is 32474781.

It is a happy number.

18747423 is a `hidden beast` number, since 187 + 474 + 2 + 3 = 666.

It is not a de Polignac number, because 18747423 - 2¹² = 18743327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18747403) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 347148 + ... + 347201.

It is an arithmetic number, because the mean of its divisors is an integer number (3471750).

Almost surely, 2^18747423 is an apocalyptic number.

18747423 is a deficient number, since it is larger than the sum of its proper divisors (9026577).

18747423 is an equidigital number, since it uses as much as digits as its factorization.

18747423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694358 (or 694352 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 18747423 is about 4329.8294423684. The cubic root of 18747423 is about 265.6524707552.

The spelling of 18747423 in words is "eighteen million, seven hundred forty-seven thousand, four hundred twenty-three".