19790494 has 4 divisors (see below), whose sum is σ = 29685744. Its totient is φ = 9895246.

The previous prime is 19790489. The next prime is 19790497. The reversal of 19790494 is 49409791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49409791 = 2357 ⋅20963.

It is a self number, because there is not a number n which added to its sum of digits gives 19790494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4947622 + ... + 4947625.

It is an arithmetic number, because the mean of its divisors is an integer number (7421436).

Almost surely, 2^19790494 is an apocalyptic number.

19790494 is a deficient number, since it is larger than the sum of its proper divisors (9895250).

19790494 is an equidigital number, since it uses as much as digits as its factorization.

19790494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895249.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 19790494 is about 4448.6508067053. The cubic root of 19790494 is about 270.4906214325.

The spelling of 19790494 in words is "nineteen million, seven hundred ninety thousand, four hundred ninety-four".