It is a happy number.
It is a congruent number.
It is an unprimeable number.
21673490 is an apocalyptic number.
1673490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 1673490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2475648).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1673490 is a wasteful number, since it uses less digits than its factorization.
1673490 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 643.
The square root of 1673490 is about 1293.6344151266. The cubic root of 1673490 is about 118.7246889729.
The spelling of 1673490 in words is "one million, six hundred seventy-three thousand, four hundred ninety".