19946398 has 4 divisors (see below), whose sum is σ = 29919600. Its totient is φ = 9973198.

The previous prime is 19946393. The next prime is 19946411. The reversal of 19946398 is 89364991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89364991 = 761 ⋅117431.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19946393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986598 + ... + 4986601.

It is an arithmetic number, because the mean of its divisors is an integer number (7479900).

Almost surely, 2^19946398 is an apocalyptic number.

19946398 is a deficient number, since it is larger than the sum of its proper divisors (9973202).

19946398 is an equidigital number, since it uses as much as digits as its factorization.

19946398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973201.

The product of its digits is 419904, while the sum is 49.

The square root of 19946398 is about 4466.1390484399. The cubic root of 19946398 is about 271.1990476758.

Adding to 19946398 its product of digits (419904), we get a palindrome (20366302).

The spelling of 19946398 in words is "nineteen million, nine hundred forty-six thousand, three hundred ninety-eight".