19813400 has 48 divisors (see below), whose sum is σ = 46433040. Its totient is φ = 7862400.

The previous prime is 19813399. The next prime is 19813403. The reversal of 19813400 is 431891.

It is a super-3 number, since 3×19813400³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19813400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19813403) 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, 31085 + ... + 31715.

It is an arithmetic number, because the mean of its divisors is an integer number (967355).

Almost surely, 2^19813400 is an apocalyptic number.

19813400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19813400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23216520).

19813400 is an abundant number, since it is smaller than the sum of its proper divisors (26619640).

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

19813400 is a wasteful number, since it uses less digits than its factorization.

19813400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 19813400 is about 4451.2245506153. The cubic root of 19813400 is about 270.5949386753.

The spelling of 19813400 in words is "nineteen million, eight hundred thirteen thousand, four hundred".