18977073 has 4 divisors (see below), whose sum is σ = 25302768. Its totient is φ = 12651380.

The previous prime is 18977033. The next prime is 18977081. The reversal of 18977073 is 37077981.

It is a happy number.

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 not a de Polignac number, because 18977073 - 2¹⁰ = 18976049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18977033) 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, 3162843 + ... + 3162848.

It is an arithmetic number, because the mean of its divisors is an integer number (6325692).

Almost surely, 2^18977073 is an apocalyptic number.

It is an amenable number.

18977073 is a deficient number, since it is larger than the sum of its proper divisors (6325695).

18977073 is an equidigital number, since it uses as much as digits as its factorization.

18977073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325694.

The product of its (nonzero) digits is 74088, while the sum is 42.

The square root of 18977073 is about 4356.2682424295. The cubic root of 18977073 is about 266.7327910673.

The spelling of 18977073 in words is "eighteen million, nine hundred seventy-seven thousand, seventy-three".