19919394 has 48 divisors (see below), whose sum is σ = 48372480. Its totient is φ = 5870880.

The previous prime is 19919387. The next prime is 19919401. The reversal of 19919394 is 49391991.

It is an interprime number because it is at equal distance from previous prime (19919387) and next prime (19919401).

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 5967 + ... + 8685.

It is an arithmetic number, because the mean of its divisors is an integer number (1007760).

Almost surely, 2^19919394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19919394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24186240).

19919394 is an abundant number, since it is smaller than the sum of its proper divisors (28453086).

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

19919394 is a wasteful number, since it uses less digits than its factorization.

19919394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775 (or 2772 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 19919394 is about 4463.1148315946. The cubic root of 19919394 is about 271.0766067473.

The spelling of 19919394 in words is "nineteen million, nine hundred nineteen thousand, three hundred ninety-four".