19981450 has 24 divisors (see below), whose sum is σ = 37449612. Its totient is φ = 7931520.

The previous prime is 19981427. The next prime is 19981463. The reversal of 19981450 is 5418991.

It can be written as a sum of positive squares in 6 ways, for example, as 15233409 + 4748041 = 3903^2 + 2179^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5392 + ... + 8308.

Almost surely, 2^19981450 is an apocalyptic number.

19981450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19981450 is a deficient number, since it is larger than the sum of its proper divisors (17468162).

19981450 is a wasteful number, since it uses less digits than its factorization.

19981450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066 (or 3061 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 19981450 is about 4470.0615208294. The cubic root of 19981450 is about 271.3578149560.

The spelling of 19981450 in words is "nineteen million, nine hundred eighty-one thousand, four hundred fifty".