19681400 has 24 divisors (see below), whose sum is σ = 45759720. Its totient is φ = 7872480.

The previous prime is 19681381. The next prime is 19681429. The reversal of 19681400 is 418691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49004 + ... + 49403.

It is an arithmetic number, because the mean of its divisors is an integer number (1906655).

Almost surely, 2^19681400 is an apocalyptic number.

19681400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19681400 is an abundant number, since it is smaller than the sum of its proper divisors (26078320).

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

19681400 is a wasteful number, since it uses less digits than its factorization.

19681400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98423 (or 98414 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 19681400 is about 4436.3723919437. The cubic root of 19681400 is about 269.9926838438.

The spelling of 19681400 in words is "nineteen million, six hundred eighty-one thousand, four hundred".