1689690 has 32 divisors (see below), whose sum is σ = 4093056. Its totient is φ = 446400.

The previous prime is 1689661. The next prime is 1689703. The reversal of 1689690 is 969861.

It is a super-2 number, since 2×1689690² = 5710104592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4344 + ... + 4716.

It is an arithmetic number, because the mean of its divisors is an integer number (127908).

2^1689690 is an apocalyptic number.

1689690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689690 is an abundant number, since it is smaller than the sum of its proper divisors (2403366).

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

1689690 is a wasteful number, since it uses less digits than its factorization.

1689690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1689690 is about 1299.8807637626. The cubic root of 1689690 is about 119.1065589794.

The spelling of 1689690 in words is "one million, six hundred eighty-nine thousand, six hundred ninety".