18949472 has 24 divisors (see below), whose sum is σ = 37403856. Its totient is φ = 9450112.

The previous prime is 18949471. The next prime is 18949487. The reversal of 18949472 is 27494981.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23378 + ... + 24174.

It is an arithmetic number, because the mean of its divisors is an integer number (1558494).

Almost surely, 2^18949472 is an apocalyptic number.

It is an amenable number.

18949472 is a deficient number, since it is larger than the sum of its proper divisors (18454384).

18949472 is an equidigital number, since it uses as much as digits as its factorization.

18949472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 1542 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 18949472 is about 4353.0991259102. The cubic root of 18949472 is about 266.6034127750.

The spelling of 18949472 in words is "eighteen million, nine hundred forty-nine thousand, four hundred seventy-two".