18980733 has 4 divisors (see below), whose sum is σ = 25307648. Its totient is φ = 12653820.

The previous prime is 18980729. The next prime is 18980743. The reversal of 18980733 is 33708981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 33708981 = 3 ⋅11236327.

It is not a de Polignac number, because 18980733 - 2² = 18980729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18980691 and 18980700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980743) 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, 3163453 + ... + 3163458.

It is an arithmetic number, because the mean of its divisors is an integer number (6326912).

Almost surely, 2^18980733 is an apocalyptic number.

It is an amenable number.

18980733 is a deficient number, since it is larger than the sum of its proper divisors (6326915).

18980733 is an equidigital number, since it uses as much as digits as its factorization.

18980733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6326914.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 18980733 is about 4356.6883065007. The cubic root of 18980733 is about 266.7499377098.

The spelling of 18980733 in words is "eighteen million, nine hundred eighty thousand, seven hundred thirty-three".