1819397 has 2 divisors, whose sum is σ = 1819398. Its totient is φ = 1819396.

The previous prime is 1819393. The next prime is 1819409. The reversal of 1819397 is 7939181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1442401 + 376996 = 1201^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1819397 - 2² = 1819393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1819397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1819393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909698 + 909699.

It is an arithmetic number, because the mean of its divisors is an integer number (909699).

2^1819397 is an apocalyptic number.

It is an amenable number.

1819397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1819397 is an equidigital number, since it uses as much as digits as its factorization.

1819397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 1819397 is about 1348.8502511398. The cubic root of 1819397 is about 122.0794295974.

The spelling of 1819397 in words is "one million, eight hundred nineteen thousand, three hundred ninety-seven".