18713439 has 12 divisors (see below), whose sum is σ = 27963000. Its totient is φ = 12045264.

The previous prime is 18713437. The next prime is 18713449. The reversal of 18713439 is 93431781.

It is a happy number.

It is not a de Polignac number, because 18713439 - 2¹ = 18713437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35589 + ... + 36110.

It is an arithmetic number, because the mean of its divisors is an integer number (2330250).

Almost surely, 2^18713439 is an apocalyptic number.

18713439 is a deficient number, since it is larger than the sum of its proper divisors (9249561).

18713439 is a wasteful number, since it uses less digits than its factorization.

18713439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71734 (or 71731 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18713439 is about 4325.9032582803. The cubic root of 18713439 is about 265.4918550067.

The spelling of 18713439 in words is "eighteen million, seven hundred thirteen thousand, four hundred thirty-nine".