19698955 has 4 divisors (see below), whose sum is σ = 23638752. Its totient is φ = 15759160.

The previous prime is 19698923. The next prime is 19698961. The reversal of 19698955 is 55989691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55989691 = 29 ⋅1930679.

It is not a de Polignac number, because 19698955 - 2⁵ = 19698923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969891 + ... + 1969900.

It is an arithmetic number, because the mean of its divisors is an integer number (5909688).

Almost surely, 2^19698955 is an apocalyptic number.

19698955 is a deficient number, since it is larger than the sum of its proper divisors (3939797).

19698955 is an equidigital number, since it uses as much as digits as its factorization.

19698955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939796.

The product of its digits is 874800, while the sum is 52.

The square root of 19698955 is about 4438.3504818795. The cubic root of 19698955 is about 270.0729341148.

The spelling of 19698955 in words is "nineteen million, six hundred ninety-eight thousand, nine hundred fifty-five".