1690434 has 12 divisors (see below), whose sum is σ = 3662646. Its totient is φ = 563472.

The previous prime is 1690433. The next prime is 1690441. The reversal of 1690434 is 4340961.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 356409 = 1155^2 + 597^2 .

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1690398 and 1690407.

It is not an unprimeable number, because it can be changed into a prime (1690433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46939 + ... + 46974.

2^1690434 is an apocalyptic number.

1690434 is an abundant number, since it is smaller than the sum of its proper divisors (1972212).

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

1690434 is a wasteful number, since it uses less digits than its factorization.

1690434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93921 (or 93918 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1690434 is about 1300.1669123616. The cubic root of 1690434 is about 119.1240379798.

The spelling of 1690434 in words is "one million, six hundred ninety thousand, four hundred thirty-four".