18470749 has 4 divisors (see below), whose sum is σ = 20149920. Its totient is φ = 16791580.

The previous prime is 18470747. The next prime is 18470759. The reversal of 18470749 is 94707481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18470749 - 2¹ = 18470747 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18470747) 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, 839569 + ... + 839590.

It is an arithmetic number, because the mean of its divisors is an integer number (5037480).

Almost surely, 2^18470749 is an apocalyptic number.

It is an amenable number.

18470749 is a deficient number, since it is larger than the sum of its proper divisors (1679171).

18470749 is a wasteful number, since it uses less digits than its factorization.

18470749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679170.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18470749 is about 4297.7609286697. The cubic root of 18470749 is about 264.3391579561.

The spelling of 18470749 in words is "eighteen million, four hundred seventy thousand, seven hundred forty-nine".