19897043 has 4 divisors (see below), whose sum is σ = 20001408. Its totient is φ = 19792680.

The previous prime is 19897037. The next prime is 19897049. The reversal of 19897043 is 34079891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34079891 = 373 ⋅91367.

It is an interprime number because it is at equal distance from previous prime (19897037) and next prime (19897049).

It is a cyclic number.

It is not a de Polignac number, because 19897043 - 2¹² = 19892947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19897049) 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, 51896 + ... + 52277.

It is an arithmetic number, because the mean of its divisors is an integer number (5000352).

Almost surely, 2^19897043 is an apocalyptic number.

19897043 is a deficient number, since it is larger than the sum of its proper divisors (104365).

19897043 is a wasteful number, since it uses less digits than its factorization.

19897043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104364.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19897043 is about 4460.6101600566. The cubic root of 19897043 is about 270.9751796189.

The spelling of 19897043 in words is "nineteen million, eight hundred ninety-seven thousand, forty-three".