1690436 has 24 divisors (see below), whose sum is σ = 3267264. Its totient is φ = 758880.

The previous prime is 1690433. The next prime is 1690441. The reversal of 1690436 is 6340961.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1690399 and 1690408.

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 7 ways as a sum of consecutive naturals, for example, 4346 + ... + 4718.

It is an arithmetic number, because the mean of its divisors is an integer number (136136).

2^1690436 is an apocalyptic number.

It is an amenable number.

1690436 is a deficient number, since it is larger than the sum of its proper divisors (1576828).

1690436 is a wasteful number, since it uses less digits than its factorization.

1690436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1690436 is about 1300.1676814934. The cubic root of 1690436 is about 119.1240849595.

The spelling of 1690436 in words is "one million, six hundred ninety thousand, four hundred thirty-six".