1999697 has 8 divisors (see below), whose sum is σ = 2294016. Its totient is φ = 1707552.

The previous prime is 1999691. The next prime is 1999703. The reversal of 1999697 is 7969991.

It is an interprime number because it is at equal distance from previous prime (1999691) and next prime (1999703).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999697 - 2⁴ = 1999681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2933 + ... + 3549.

It is an arithmetic number, because the mean of its divisors is an integer number (286752).

2^1999697 is an apocalyptic number.

It is an amenable number.

1999697 is a deficient number, since it is larger than the sum of its proper divisors (294319).

1999697 is an equidigital number, since it uses as much as digits as its factorization.

1999697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087.

The product of its digits is 275562, while the sum is 50.

The square root of 1999697 is about 1414.1064316380. The cubic root of 1999697 is about 125.9857420668.

The spelling of 1999697 in words is "one million, nine hundred ninety-nine thousand, six hundred ninety-seven".