1664970 has 64 divisors (see below), whose sum is σ = 4423680. Its totient is φ = 399168.

The previous prime is 1664959. The next prime is 1664987. The reversal of 1664970 is 794661.

1664970 = T₃₉₈ + T₃₉₉ + ... + T₄₁₇.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13047 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (69120).

2^1664970 is an apocalyptic number.

1664970 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 1664970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211840).

1664970 is an abundant number, since it is smaller than the sum of its proper divisors (2758710).

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

1664970 is a wasteful number, since it uses less digits than its factorization.

1664970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 1664970 is about 1290.3371652402. The cubic root of 1664970 is about 118.5228640744.

The spelling of 1664970 in words is "one million, six hundred sixty-four thousand, nine hundred seventy".