19894294397 has 2 divisors, whose sum is σ = 19894294398. Its totient is φ = 19894294396.

The previous prime is 19894294391. The next prime is 19894294403. The reversal of 19894294397 is 79349249891.

It is a balanced prime because it is at equal distance from previous prime (19894294391) and next prime (19894294403).

It can be written as a sum of positive squares in only one way, i.e., 19219385956 + 674908441 = 138634^2 + 25979^2 .

It is a cyclic number.

It is not a de Polignac number, because 19894294397 - 2¹² = 19894290301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19894294391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9947147198 + 9947147199.

It is an arithmetic number, because the mean of its divisors is an integer number (9947147199).

Almost surely, 2^19894294397 is an apocalyptic number.

It is an amenable number.

19894294397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19894294397 is an equidigital number, since it uses as much as digits as its factorization.

19894294397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 65.

The spelling of 19894294397 in words is "nineteen billion, eight hundred ninety-four million, two hundred ninety-four thousand, three hundred ninety-seven".