19494997 has 4 divisors (see below), whose sum is σ = 19507840. Its totient is φ = 19482156.

The previous prime is 19494949. The next prime is 19495009. The reversal of 19494997 is 79949491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19494997 - 2¹⁹ = 18970709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19494947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3783 + ... + 7300.

It is an arithmetic number, because the mean of its divisors is an integer number (4876960).

Almost surely, 2^19494997 is an apocalyptic number.

It is an amenable number.

19494997 is a deficient number, since it is larger than the sum of its proper divisors (12843).

19494997 is a wasteful number, since it uses less digits than its factorization.

19494997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12842.

The product of its digits is 734832, while the sum is 52.

The square root of 19494997 is about 4415.3139186246. The cubic root of 19494997 is about 269.1376096503.

The spelling of 19494997 in words is "nineteen million, four hundred ninety-four thousand, nine hundred ninety-seven".