19426397 has 2 divisors, whose sum is σ = 19426398. Its totient is φ = 19426396.

The previous prime is 19426391. The next prime is 19426409. The reversal of 19426397 is 79362491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 2869636 = 4069^2 + 1694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19426397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19426391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9713198 + 9713199.

It is an arithmetic number, because the mean of its divisors is an integer number (9713199).

Almost surely, 2^19426397 is an apocalyptic number.

It is an amenable number.

19426397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19426397 is an equidigital number, since it uses as much as digits as its factorization.

19426397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 19426397 is about 4407.5386555310. The cubic root of 19426397 is about 268.8215535453.

The spelling of 19426397 in words is "nineteen million, four hundred twenty-six thousand, three hundred ninety-seven".