18670573 has 4 divisors (see below), whose sum is σ = 19768860. Its totient is φ = 17572288.

The previous prime is 18670567. The next prime is 18670579. The reversal of 18670573 is 37507681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37507681 = 229 ⋅163789.

It is an interprime number because it is at equal distance from previous prime (18670567) and next prime (18670579).

It can be written as a sum of positive squares in 2 ways, for example, as 7767369 + 10903204 = 2787^2 + 3302^2 .

It is not a de Polignac number, because 18670573 - 2⁹ = 18670061 is a prime.

It is a super-2 number, since 2×18670573² = 697180592296658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18670579) 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, 549118 + ... + 549151.

It is an arithmetic number, because the mean of its divisors is an integer number (4942215).

Almost surely, 2^18670573 is an apocalyptic number.

It is an amenable number.

18670573 is a deficient number, since it is larger than the sum of its proper divisors (1098287).

18670573 is a wasteful number, since it uses less digits than its factorization.

18670573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098286.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 18670573 is about 4320.9458455297. The cubic root of 18670573 is about 265.2889834308.

The spelling of 18670573 in words is "eighteen million, six hundred seventy thousand, five hundred seventy-three".