18996737 has 4 divisors (see below), whose sum is σ = 19355220. Its totient is φ = 18638256.

The previous prime is 18996727. The next prime is 18996743. The reversal of 18996737 is 73769981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73769981 = 3343 ⋅22067.

It can be written as a sum of positive squares in 2 ways, for example, as 12666481 + 6330256 = 3559^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 18996737 - 2⁴ = 18996721 is a prime.

It is a super-3 number, since 3×18996737³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18996727) 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, 179162 + ... + 179267.

It is an arithmetic number, because the mean of its divisors is an integer number (4838805).

Almost surely, 2^18996737 is an apocalyptic number.

It is an amenable number.

18996737 is a deficient number, since it is larger than the sum of its proper divisors (358483).

18996737 is an equidigital number, since it uses as much as digits as its factorization.

18996737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358482.

The product of its digits is 571536, while the sum is 50.

The square root of 18996737 is about 4358.5246356996. The cubic root of 18996737 is about 266.8248885686.

The spelling of 18996737 in words is "eighteen million, nine hundred ninety-six thousand, seven hundred thirty-seven".