18907443 has 12 divisors (see below), whose sum is σ = 27363648. Its totient is φ = 12580560.

The previous prime is 18907439. The next prime is 18907463. The reversal of 18907443 is 34470981.

It is a happy number.

It is not a de Polignac number, because 18907443 - 2² = 18907439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18907398 and 18907407.

It is not an unprimeable number, because it can be changed into a prime (18907463) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3733 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (2280304).

Almost surely, 2^18907443 is an apocalyptic number.

18907443 is a deficient number, since it is larger than the sum of its proper divisors (8456205).

18907443 is a wasteful number, since it uses less digits than its factorization.

18907443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074 (or 4071 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 18907443 is about 4348.2689659220. The cubic root of 18907443 is about 266.4061624389.

The spelling of 18907443 in words is "eighteen million, nine hundred seven thousand, four hundred forty-three".