1839997 has 2 divisors, whose sum is σ = 1839998. Its totient is φ = 1839996.

The previous prime is 1839991. The next prime is 1840019. The reversal of 1839997 is 7999381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 811801 = 1014^2 + 901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1839997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1839991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 919998 + 919999.

It is an arithmetic number, because the mean of its divisors is an integer number (919999).

2^1839997 is an apocalyptic number.

It is an amenable number.

1839997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1839997 is an equidigital number, since it uses as much as digits as its factorization.

1839997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1839997 is about 1356.4648908099. The cubic root of 1839997 is about 122.5384469075.

It can be divided in two parts, 18399 and 97, that added together give a square (18496 = 136²).

The spelling of 1839997 in words is "one million, eight hundred thirty-nine thousand, nine hundred ninety-seven".