19897426 has 4 divisors (see below), whose sum is σ = 29846142. Its totient is φ = 9948712.

The previous prime is 19897387. The next prime is 19897481. The reversal of 19897426 is 62479891.

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

It can be written as a sum of positive squares in only one way, i.e., 11189025 + 8708401 = 3345^2 + 2951^2 .

It is a super-2 number, since 2×19897426² = 791815122850952, which contains 22 as substring.

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, 4974355 + ... + 4974358.

Almost surely, 2^19897426 is an apocalyptic number.

19897426 is a deficient number, since it is larger than the sum of its proper divisors (9948716).

19897426 is an equidigital number, since it uses as much as digits as its factorization.

19897426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9948715.

The product of its digits is 217728, while the sum is 46.

The square root of 19897426 is about 4460.6530911964. The cubic root of 19897426 is about 270.9769182830.

The spelling of 19897426 in words is "nineteen million, eight hundred ninety-seven thousand, four hundred twenty-six".