19471998 has 64 divisors (see below), whose sum is σ = 50480640. Its totient is φ = 4862592.

The previous prime is 19471997. The next prime is 19472003. The reversal of 19471998 is 89917491.

It is a super-2 number, since 2×19471998² = 758317412224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19471997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9436 + ... + 11312.

It is an arithmetic number, because the mean of its divisors is an integer number (788760).

Almost surely, 2^19471998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19471998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25240320).

19471998 is an abundant number, since it is smaller than the sum of its proper divisors (31008642).

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

19471998 is a wasteful number, since it uses less digits than its factorization.

19471998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its digits is 163296, while the sum is 48.

The square root of 19471998 is about 4412.7086919487. The cubic root of 19471998 is about 269.0317306627.

The spelling of 19471998 in words is "nineteen million, four hundred seventy-one thousand, nine hundred ninety-eight".