18963709 has 6 divisors (see below), whose sum is σ = 19641050. Its totient is φ = 18308976.

The previous prime is 18963649. The next prime is 18963727. The reversal of 18963709 is 90736981.

It can be written as a sum of positive squares in 3 ways, for example, as 9060100 + 9903609 = 3010^2 + 3147^2 .

It is not a de Polignac number, because 18963709 - 2¹¹ = 18961661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18963739) 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, 10434 + ... + 12115.

Almost surely, 2^18963709 is an apocalyptic number.

It is an amenable number.

18963709 is a deficient number, since it is larger than the sum of its proper divisors (677341).

18963709 is an equidigital number, since it uses as much as digits as its factorization.

18963709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22607 (or 22578 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18963709 is about 4354.7340906191. The cubic root of 18963709 is about 266.6701636694.

The spelling of 18963709 in words is "eighteen million, nine hundred sixty-three thousand, seven hundred nine".