19813450 has 12 divisors (see below), whose sum is σ = 36853110. Its totient is φ = 7925360.

The previous prime is 19813429. The next prime is 19813457. The reversal of 19813450 is 5431891.

It can be written as a sum of positive squares in 3 ways, for example, as 10517049 + 9296401 = 3243^2 + 3049^2 .

It is a super-3 number, since 3×19813450³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19813457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198085 + ... + 198184.

Almost surely, 2^19813450 is an apocalyptic number.

19813450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19813450 is a deficient number, since it is larger than the sum of its proper divisors (17039660).

19813450 is a wasteful number, since it uses less digits than its factorization.

19813450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396281 (or 396276 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 19813450 is about 4451.2301670437. The cubic root of 19813450 is about 270.5951662945.

The spelling of 19813450 in words is "nineteen million, eight hundred thirteen thousand, four hundred fifty".