19881498 has 48 divisors (see below), whose sum is σ = 49225536. Its totient is φ = 5241600.

The previous prime is 19881497. The next prime is 19881503. The reversal of 19881498 is 89418891.

It is not an unprimeable number, because it can be changed into a prime (19881497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5698 + ... + 8498.

It is an arithmetic number, because the mean of its divisors is an integer number (1025532).

Almost surely, 2^19881498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19881498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24612768).

19881498 is an abundant number, since it is smaller than the sum of its proper divisors (29344038).

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

19881498 is a wasteful number, since it uses less digits than its factorization.

19881498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2826 counting only the distinct ones).

The product of its digits is 165888, while the sum is 48.

The square root of 19881498 is about 4458.8673449655. The cubic root of 19881498 is about 270.9045928047.

It can be divided in two parts, 1988 and 1498, that added together give a triangular number (3486 = T₈₃).

The spelling of 19881498 in words is "nineteen million, eight hundred eighty-one thousand, four hundred ninety-eight".