19981354 has 4 divisors (see below), whose sum is σ = 29972034. Its totient is φ = 9990676.

The previous prime is 19981333. The next prime is 19981361. The reversal of 19981354 is 45318991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45318991 = 17 ⋅2665823.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 2634129 = 4165^2 + 1623^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995337 + ... + 4995340.

Almost surely, 2^19981354 is an apocalyptic number.

19981354 is a deficient number, since it is larger than the sum of its proper divisors (9990680).

19981354 is an equidigital number, since it uses as much as digits as its factorization.

19981354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9990679.

The product of its digits is 38880, while the sum is 40.

The square root of 19981354 is about 4470.0507827093. The cubic root of 19981354 is about 271.3573803797.

The spelling of 19981354 in words is "nineteen million, nine hundred eighty-one thousand, three hundred fifty-four".