18939849 has 8 divisors (see below), whose sum is σ = 25446432. Its totient is φ = 12529920.

The previous prime is 18939847. The next prime is 18939857. The reversal of 18939849 is 94893981.

It is a happy number.

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

It is not a de Polignac number, because 18939849 - 2¹ = 18939847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18939841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23704 + ... + 24489.

It is an arithmetic number, because the mean of its divisors is an integer number (3180804).

Almost surely, 2^18939849 is an apocalyptic number.

It is an amenable number.

18939849 is a deficient number, since it is larger than the sum of its proper divisors (6506583).

18939849 is a wasteful number, since it uses less digits than its factorization.

18939849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48327.

The product of its digits is 559872, while the sum is 51.

The square root of 18939849 is about 4351.9936810616. The cubic root of 18939849 is about 266.5582759142.

The spelling of 18939849 in words is "eighteen million, nine hundred thirty-nine thousand, eight hundred forty-nine".