1651968 has 72 divisors (see below), whose sum is σ = 4905600. Its totient is φ = 548352.

The previous prime is 1651961. The next prime is 1651981. The reversal of 1651968 is 8691561.

It is a tau number, because it is divible by the number of its divisors (72).

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 (1651961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6793 + ... + 7031.

2^1651968 is an apocalyptic number.

1651968 is a gapful number since it is divisible by the number (18) 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 1651968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2452800).

1651968 is an abundant number, since it is smaller than the sum of its proper divisors (3253632).

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

1651968 is an equidigital number, since it uses as much as digits as its factorization.

1651968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 244 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1651968 is about 1285.2890725436. The cubic root of 1651968 is about 118.2135365465.

It can be divided in two parts, 16 and 51968, that added together give a square (51984 = 228²).

The spelling of 1651968 in words is "one million, six hundred fifty-one thousand, nine hundred sixty-eight".