19798450 has 36 divisors (see below), whose sum is σ = 42842682. Its totient is φ = 6787200.

The previous prime is 19798439. The next prime is 19798451. The reversal of 19798450 is 5489791.

It can be written as a sum of positive squares in 3 ways, for example, as 13198689 + 6599761 = 3633^2 + 2569^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19798397 and 19798406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19798451) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1591 + ... + 6490.

Almost surely, 2^19798450 is an apocalyptic number.

19798450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19798450 is an abundant number, since it is smaller than the sum of its proper divisors (23044232).

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

19798450 is a wasteful number, since it uses less digits than its factorization.

19798450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8107 (or 8095 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 19798450 is about 4449.5449205509. The cubic root of 19798450 is about 270.5268633284.

The spelling of 19798450 in words is "nineteen million, seven hundred ninety-eight thousand, four hundred fifty".