1659672 has 96 divisors (see below), whose sum is σ = 5335200. Its totient is φ = 456192.

The previous prime is 1659667. The next prime is 1659673. The reversal of 1659672 is 2769561.

It is a super-2 number, since 2×1659672² = 5509022295168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18604 + ... + 18692.

It is an arithmetic number, because the mean of its divisors is an integer number (55575).

2^1659672 is an apocalyptic number.

1659672 is a gapful number since it is divisible by the number (12) 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 1659672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667600).

1659672 is an abundant number, since it is smaller than the sum of its proper divisors (3675528).

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

1659672 is a wasteful number, since it uses less digits than its factorization.

1659672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 138 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 1659672 is about 1288.2825776979. The cubic root of 1659672 is about 118.3970156905.

The spelling of 1659672 in words is "one million, six hundred fifty-nine thousand, six hundred seventy-two".