1651672 has 24 divisors (see below), whose sum is σ = 3403260. Its totient is φ = 745280.

The previous prime is 1651667. The next prime is 1651681. The reversal of 1651672 is 2761561.

It is a self number, because there is not a number n which added to its sum of digits gives 1651672.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 11988 + ... + 12124.

2^1651672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701630).

1651672 is an abundant number, since it is smaller than the sum of its proper divisors (1751588).

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

1651672 is a wasteful number, since it uses less digits than its factorization.

1651672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 150 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 1651672 is about 1285.1739181916. The cubic root of 1651672 is about 118.2064756154.

The spelling of 1651672 in words is "one million, six hundred fifty-one thousand, six hundred seventy-two".