18479817 has 6 divisors (see below), whose sum is σ = 26693082. Its totient is φ = 12319872.

The previous prime is 18479753. The next prime is 18479819. The reversal of 18479817 is 71897481.

It can be written as a sum of positive squares in only one way, i.e., 14107536 + 4372281 = 3756^2 + 2091^2 .

It is not a de Polignac number, because 18479817 - 2⁶ = 18479753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18479819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1026648 + ... + 1026665.

It is an arithmetic number, because the mean of its divisors is an integer number (4448847).

Almost surely, 2^18479817 is an apocalyptic number.

It is an amenable number.

18479817 is a deficient number, since it is larger than the sum of its proper divisors (8213265).

18479817 is a wasteful number, since it uses less digits than its factorization.

18479817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053319 (or 2053316 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 18479817 is about 4298.8157671619. The cubic root of 18479817 is about 264.3824089602.

It can be divided in two parts, 1847 and 9817, that added together give a square (11664 = 108²).

The spelling of 18479817 in words is "eighteen million, four hundred seventy-nine thousand, eight hundred seventeen".