18891434 has 16 divisors (see below), whose sum is σ = 29914080. Its totient is φ = 8922960.

The previous prime is 18891409. The next prime is 18891443. The reversal of 18891434 is 43419881.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22889 + ... + 23699.

It is an arithmetic number, because the mean of its divisors is an integer number (1869630).

Almost surely, 2^18891434 is an apocalyptic number.

18891434 is a deficient number, since it is larger than the sum of its proper divisors (11022646).

18891434 is a wasteful number, since it uses less digits than its factorization.

18891434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445.

The product of its digits is 27648, while the sum is 38.

The square root of 18891434 is about 4346.4277286066. The cubic root of 18891434 is about 266.3309521893.

The spelling of 18891434 in words is "eighteen million, eight hundred ninety-one thousand, four hundred thirty-four".