18472709 has 4 divisors (see below), whose sum is σ = 18732960. Its totient is φ = 18212460.

The previous prime is 18472697. The next prime is 18472711. The reversal of 18472709 is 90727481.

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 18472709 - 2²⁴ = 1695493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18472789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130019 + ... + 130160.

It is an arithmetic number, because the mean of its divisors is an integer number (4683240).

Almost surely, 2^18472709 is an apocalyptic number.

It is an amenable number.

18472709 is a deficient number, since it is larger than the sum of its proper divisors (260251).

18472709 is an equidigital number, since it uses as much as digits as its factorization.

18472709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260250.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 18472709 is about 4297.9889483339. The cubic root of 18472709 is about 264.3485076297.

The spelling of 18472709 in words is "eighteen million, four hundred seventy-two thousand, seven hundred nine".