19031998 has 4 divisors (see below), whose sum is σ = 28548000. Its totient is φ = 9515998.

The previous prime is 19031963. The next prime is 19032029. The reversal of 19031998 is 89913091.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 19031998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4757998 + ... + 4758001.

It is an arithmetic number, because the mean of its divisors is an integer number (7137000).

Almost surely, 2^19031998 is an apocalyptic number.

19031998 is a deficient number, since it is larger than the sum of its proper divisors (9516002).

19031998 is an equidigital number, since it uses as much as digits as its factorization.

19031998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516001.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19031998 is about 4362.5678218224. The cubic root of 19031998 is about 266.9898765023.

The spelling of 19031998 in words is "nineteen million, thirty-one thousand, nine hundred ninety-eight".