18471744 has 42 divisors (see below), whose sum is σ = 52947570. Its totient is φ = 6157056.

The previous prime is 18471727. The next prime is 18471749. The reversal of 18471744 is 44717481.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 831744 = 4200^2 + 912^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18471699 and 18471708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18471749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15459 + ... + 16610.

Almost surely, 2^18471744 is an apocalyptic number.

It is an amenable number.

18471744 is an abundant number, since it is smaller than the sum of its proper divisors (34475826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18471744 is a wasteful number, since it uses less digits than its factorization.

18471744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32087 (or 32074 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 18471744 is about 4297.8766850621. The cubic root of 18471744 is about 264.3439044292.

The spelling of 18471744 in words is "eighteen million, four hundred seventy-one thousand, seven hundred forty-four".