18813403 has 12 divisors (see below), whose sum is σ = 22396440. Its totient is φ = 15748992.

The previous prime is 18813391. The next prime is 18813419. The reversal of 18813403 is 30431881.

It is not a de Polignac number, because 18813403 - 2¹³ = 18805211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18810403) 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, 2358 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (1866370).

Almost surely, 2^18813403 is an apocalyptic number.

18813403 is a deficient number, since it is larger than the sum of its proper divisors (3583037).

18813403 is an equidigital number, since it uses as much as digits as its factorization.

18813403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8986 (or 8979 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18813403 is about 4337.4419880847. The cubic root of 18813403 is about 265.9637531404.

The spelling of 18813403 in words is "eighteen million, eight hundred thirteen thousand, four hundred three".