18880709 has 4 divisors (see below), whose sum is σ = 19029504. Its totient is φ = 18731916.

The previous prime is 18880691. The next prime is 18880717. The reversal of 18880709 is 90708881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18880709 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 (18880739) 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, 74207 + ... + 74460.

It is an arithmetic number, because the mean of its divisors is an integer number (4757376).

Almost surely, 2^18880709 is an apocalyptic number.

It is an amenable number.

18880709 is a deficient number, since it is larger than the sum of its proper divisors (148795).

18880709 is a wasteful number, since it uses less digits than its factorization.

18880709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148794.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18880709 is about 4345.1937816397. The cubic root of 18880709 is about 266.2805423903.

The spelling of 18880709 in words is "eighteen million, eight hundred eighty thousand, seven hundred nine".