18472897 has 4 divisors (see below), whose sum is σ = 19559556. Its totient is φ = 17386240.

The previous prime is 18472877. The next prime is 18472957. The reversal of 18472897 is 79827481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16719921 + 1752976 = 4089^2 + 1324^2 .

It is not a de Polignac number, because 18472897 - 2¹⁵ = 18440129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18472877) 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, 543304 + ... + 543337.

It is an arithmetic number, because the mean of its divisors is an integer number (4889889).

Almost surely, 2^18472897 is an apocalyptic number.

18472897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18472897 is a deficient number, since it is larger than the sum of its proper divisors (1086659).

18472897 is a wasteful number, since it uses less digits than its factorization.

18472897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086658.

The product of its digits is 225792, while the sum is 46.

The square root of 18472897 is about 4298.0108189720. The cubic root of 18472897 is about 264.3494044004.

The spelling of 18472897 in words is "eighteen million, four hundred seventy-two thousand, eight hundred ninety-seven".