1690433 has 2 divisors, whose sum is σ = 1690434. Its totient is φ = 1690432.

The previous prime is 1690427. The next prime is 1690441. The reversal of 1690433 is 3340961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1555009 + 135424 = 1247^2 + 368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1690483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845216 + 845217.

It is an arithmetic number, because the mean of its divisors is an integer number (845217).

2^1690433 is an apocalyptic number.

It is an amenable number.

1690433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690433 is an equidigital number, since it uses as much as digits as its factorization.

1690433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1690433 is about 1300.1665277956. The cubic root of 1690433 is about 119.1240144900.

The spelling of 1690433 in words is "one million, six hundred ninety thousand, four hundred thirty-three".