19897862 has 4 divisors (see below), whose sum is σ = 29846796. Its totient is φ = 9948930.

The previous prime is 19897859. The next prime is 19897903. The reversal of 19897862 is 26879891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26879891 = 353 ⋅76147.

It is a self number, because there is not a number n which added to its sum of digits gives 19897862.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4974464 + ... + 4974467.

It is an arithmetic number, because the mean of its divisors is an integer number (7461699).

Almost surely, 2^19897862 is an apocalyptic number.

19897862 is a deficient number, since it is larger than the sum of its proper divisors (9948934).

19897862 is an equidigital number, since it uses as much as digits as its factorization.

19897862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9948933.

The product of its digits is 435456, while the sum is 50.

The square root of 19897862 is about 4460.7019626960. The cubic root of 19897862 is about 270.9788975185.

The spelling of 19897862 in words is "nineteen million, eight hundred ninety-seven thousand, eight hundred sixty-two".