651992 has 32 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 285600.

The previous prime is 651971. The next prime is 651997. The reversal of 651992 is 299156.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651992.

It is not an unprimeable number, because it can be changed into a prime (651997) by changing a digit.

651992 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 7 ways as a sum of consecutive naturals, for example, 2609 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (43200).

2⁶⁵¹⁹⁹² is an apocalyptic number.

651992 is a gapful number since it is divisible by the number (62) 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 651992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691200).

651992 is an abundant number, since it is smaller than the sum of its proper divisors (730408).

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

651992 is a wasteful number, since it uses less digits than its factorization.

651992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 283 counting only the distinct ones).

The product of its digits is 4860, while the sum is 32.

The square root of 651992 is about 807.4602157382. The cubic root of 651992 is about 86.7123099484.

Subtracting from 651992 its reverse (299156), we obtain a square (352836 = 594²).

The spelling of 651992 in words is "six hundred fifty-one thousand, nine hundred ninety-two".