19998345 has 24 divisors (see below), whose sum is σ = 32633856. Its totient is φ = 10457632.

The previous prime is 19998337. The next prime is 19998353. The reversal of 19998345 is 54389991.

It is an interprime number because it is at equal distance from previous prime (19998337) and next prime (19998353).

It is not a de Polignac number, because 19998345 - 2³ = 19998337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19998294 and 19998303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52024 + ... + 52406.

It is an arithmetic number, because the mean of its divisors is an integer number (1359744).

Almost surely, 2^19998345 is an apocalyptic number.

19998345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19998345 is a deficient number, since it is larger than the sum of its proper divisors (12635511).

19998345 is an equidigital number, since it uses as much as digits as its factorization.

19998345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 450 counting only the distinct ones).

The product of its digits is 349920, while the sum is 48.

The square root of 19998345 is about 4471.9509165464. The cubic root of 19998345 is about 271.4342741844.

It can be divided in two parts, 199983 and 45, that added together give a triangular number (200028 = T₆₃₂).

The spelling of 19998345 in words is "nineteen million, nine hundred ninety-eight thousand, three hundred forty-five".