18813297 has 16 divisors (see below), whose sum is σ = 25610240. Its totient is φ = 12282192.

The previous prime is 18813283. The next prime is 18813307. The reversal of 18813297 is 79231881.

It is not a de Polignac number, because 18813297 - 2⁴ = 18813281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18813217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38388 + ... + 38874.

It is an arithmetic number, because the mean of its divisors is an integer number (1600640).

Almost surely, 2^18813297 is an apocalyptic number.

It is an amenable number.

18813297 is a deficient number, since it is larger than the sum of its proper divisors (6796943).

18813297 is a wasteful number, since it uses less digits than its factorization.

18813297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its digits is 24192, while the sum is 39.

The square root of 18813297 is about 4337.4297688839. The cubic root of 18813297 is about 265.9632536346.

It can be divided in two parts, 18813 and 297, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18813297 in words is "eighteen million, eight hundred thirteen thousand, two hundred ninety-seven".