1690693 has 2 divisors, whose sum is σ = 1690694. Its totient is φ = 1690692.

The previous prime is 1690691. The next prime is 1690727. The reversal of 1690693 is 3960961.

It is an a-pointer prime, because the next prime (1690727) can be obtained adding 1690693 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 954529 + 736164 = 977^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690693 - 2¹ = 1690691 is a prime.

Together with 1690691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845346 + 845347.

It is an arithmetic number, because the mean of its divisors is an integer number (845347).

2^1690693 is an apocalyptic number.

It is an amenable number.

1690693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690693 is an equidigital number, since it uses as much as digits as its factorization.

1690693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 1690693 is about 1300.2665111430. The cubic root of 1690693 is about 119.1301215359.

It can be divided in two parts, 16 and 90693, that added together give a palindrome (90709).

The spelling of 1690693 in words is "one million, six hundred ninety thousand, six hundred ninety-three".