18941489 has 16 divisors (see below), whose sum is σ = 23059200. Its totient is φ = 15529668.

The previous prime is 18941477. The next prime is 18941497. The reversal of 18941489 is 98414981.

It is not a de Polignac number, because 18941489 - 2¹² = 18937393 is a prime.

It is a Duffinian number.

Its product of digits (82944) is a multiple of the sum of its prime factors (72).

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18941449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 823532 + ... + 823554.

It is an arithmetic number, because the mean of its divisors is an integer number (1441200).

Almost surely, 2^18941489 is an apocalyptic number.

It is an amenable number.

18941489 is a deficient number, since it is larger than the sum of its proper divisors (4117711).

18941489 is an frugal number, since it uses more digits than its factorization.

18941489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 30 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 18941489 is about 4352.1820963742. The cubic root of 18941489 is about 266.5659694453.

The spelling of 18941489 in words is "eighteen million, nine hundred forty-one thousand, four hundred eighty-nine".