19394918 has 4 divisors (see below), whose sum is σ = 29092380. Its totient is φ = 9697458.

The previous prime is 19394917. The next prime is 19394971. The reversal of 19394918 is 81949391.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19394917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4848728 + ... + 4848731.

It is an arithmetic number, because the mean of its divisors is an integer number (7273095).

Almost surely, 2^19394918 is an apocalyptic number.

19394918 is a deficient number, since it is larger than the sum of its proper divisors (9697462).

19394918 is an equidigital number, since it uses as much as digits as its factorization.

19394918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9697461.

The product of its digits is 69984, while the sum is 44.

The square root of 19394918 is about 4403.9661669908. The cubic root of 19394918 is about 268.6762734125.

The spelling of 19394918 in words is "nineteen million, three hundred ninety-four thousand, nine hundred eighteen".