1690420 has 12 divisors (see below), whose sum is σ = 3549924. Its totient is φ = 676160.

The previous prime is 1690393. The next prime is 1690421. The reversal of 1690420 is 240961.

It can be written as a sum of positive squares in 2 ways, for example, as 197136 + 1493284 = 444^2 + 1222^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1690391 and 1690400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42241 + ... + 42280.

It is an arithmetic number, because the mean of its divisors is an integer number (295827).

2^1690420 is an apocalyptic number.

1690420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1690420 is an abundant number, since it is smaller than the sum of its proper divisors (1859504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1690420 is a wasteful number, since it uses less digits than its factorization.

1690420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84530 (or 84528 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1690420 is about 1300.1615284264. The cubic root of 1690420 is about 119.1237091212.

The spelling of 1690420 in words is "one million, six hundred ninety thousand, four hundred twenty".