19490071 has 4 divisors (see below), whose sum is σ = 19683144. Its totient is φ = 19297000.

The previous prime is 19490063. The next prime is 19490087. The reversal of 19490071 is 17009491.

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

It is a cyclic number.

It is not a de Polignac number, because 19490071 - 2³ = 19490063 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400071) 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, 96385 + ... + 96586.

It is an arithmetic number, because the mean of its divisors is an integer number (4920786).

Almost surely, 2^19490071 is an apocalyptic number.

19490071 is a deficient number, since it is larger than the sum of its proper divisors (193073).

19490071 is a wasteful number, since it uses less digits than its factorization.

19490071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193072.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 19490071 is about 4414.7560521506. The cubic root of 19490071 is about 269.1149391578.

The spelling of 19490071 in words is "nineteen million, four hundred ninety thousand, seventy-one".