19397994 has 64 divisors (see below), whose sum is σ = 48909312. Its totient is φ = 5023920.

The previous prime is 19397977. The next prime is 19398019. The reversal of 19397994 is 49979391.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55729 + ... + 56075.

It is an arithmetic number, because the mean of its divisors is an integer number (764208).

Almost surely, 2^19397994 is an apocalyptic number.

19397994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19397994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24454656).

19397994 is an abundant number, since it is smaller than the sum of its proper divisors (29511318).

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

19397994 is a wasteful number, since it uses less digits than its factorization.

19397994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 370 counting only the distinct ones).

The product of its digits is 551124, while the sum is 51.

The square root of 19397994 is about 4404.3153838026. The cubic root of 19397994 is about 268.6904765237.

The spelling of 19397994 in words is "nineteen million, three hundred ninety-seven thousand, nine hundred ninety-four".