1690864 has 40 divisors (see below), whose sum is σ = 3872768. Its totient is φ = 699840.

The previous prime is 1690853. The next prime is 1690883. The reversal of 1690864 is 4680961.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3229 + ... + 3715.

2^1690864 is an apocalyptic number.

1690864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1936384).

1690864 is an abundant number, since it is smaller than the sum of its proper divisors (2181904).

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

1690864 is a wasteful number, since it uses less digits than its factorization.

1690864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1690864 is about 1300.3322652307. The cubic root of 1690864 is about 119.1341377518.

The spelling of 1690864 in words is "one million, six hundred ninety thousand, eight hundred sixty-four".