19918434 has 16 divisors (see below), whose sum is σ = 39906720. Its totient is φ = 6627840.

The previous prime is 19918429. The next prime is 19918439. The reversal of 19918434 is 43481991.

It is an interprime number because it is at equal distance from previous prime (19918429) and next prime (19918439).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19918392 and 19918401.

It is not an unprimeable number, because it can be changed into a prime (19918439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (2494170).

Almost surely, 2^19918434 is an apocalyptic number.

19918434 is an abundant number, since it is smaller than the sum of its proper divisors (19988286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19918434 is a wasteful number, since it uses less digits than its factorization.

19918434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825.

The product of its digits is 31104, while the sum is 39.

The square root of 19918434 is about 4463.0072820913. The cubic root of 19918434 is about 271.0722519006.

The spelling of 19918434 in words is "nineteen million, nine hundred eighteen thousand, four hundred thirty-four".