1690480 has 80 divisors (see below), whose sum is σ = 4580064. Its totient is φ = 573440.

The previous prime is 1690441. The next prime is 1690483. The reversal of 1690480 is 840961.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690483) 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 15 ways as a sum of consecutive naturals, for example, 14904 + ... + 15016.

2^1690480 is an apocalyptic number.

1690480 is a gapful number since it is divisible by the number (10) 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 1690480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2290032).

1690480 is an abundant number, since it is smaller than the sum of its proper divisors (2889584).

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

1690480 is a wasteful number, since it uses less digits than its factorization.

1690480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1690480 is about 1300.1846022777. The cubic root of 1690480 is about 119.1251185023.

The spelling of 1690480 in words is "one million, six hundred ninety thousand, four hundred eighty".