18988949 has 8 divisors (see below), whose sum is σ = 22978368. Its totient is φ = 15318720.

The previous prime is 18988943. The next prime is 18988967. The reversal of 18988949 is 94988981.

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

It is a cyclic number.

It is not a de Polignac number, because 18988949 - 2⁴ = 18988933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18988894 and 18988903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988943) 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, 79667 + ... + 79904.

It is an arithmetic number, because the mean of its divisors is an integer number (2872296).

Almost surely, 2^18988949 is an apocalyptic number.

It is an amenable number.

18988949 is a deficient number, since it is larger than the sum of its proper divisors (3989419).

18988949 is a wasteful number, since it uses less digits than its factorization.

18988949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159595.

The product of its digits is 1492992, while the sum is 56.

The square root of 18988949 is about 4357.6311225252. The cubic root of 18988949 is about 266.7884206167.

The spelling of 18988949 in words is "eighteen million, nine hundred eighty-eight thousand, nine hundred forty-nine".