19143997 has 4 divisors (see below), whose sum is σ = 19319740. Its totient is φ = 18968256.

The previous prime is 19143983. The next prime is 19144003. The reversal of 19143997 is 79934191.

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: 79934191 = 227 ⋅352133.

It can be written as a sum of positive squares in 2 ways, for example, as 9865881 + 9278116 = 3141^2 + 3046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19143997 is a prime.

It is a super-2 number, since 2×19143997² = 732985242272018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19143937) 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, 87708 + ... + 87925.

It is an arithmetic number, because the mean of its divisors is an integer number (4829935).

Almost surely, 2^19143997 is an apocalyptic number.

It is an amenable number.

19143997 is a deficient number, since it is larger than the sum of its proper divisors (175743).

19143997 is a wasteful number, since it uses less digits than its factorization.

19143997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175742.

The product of its digits is 61236, while the sum is 43.

The square root of 19143997 is about 4375.3853544574. The cubic root of 19143997 is about 267.5125775086.

The spelling of 19143997 in words is "nineteen million, one hundred forty-three thousand, nine hundred ninety-seven".