4322640 has 160 divisors (see below), whose sum is σ = 15998976. Its totient is φ = 944640.

The previous prime is 4322603. The next prime is 4322651. The reversal of 4322640 is 462234.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 52039 + ... + 52121.

Almost surely, 2^4322640 is an apocalyptic number.

4322640 is a gapful number since it is divisible by the number (40) 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 4322640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7999488).

4322640 is an abundant number, since it is smaller than the sum of its proper divisors (11676336).

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

4322640 is a wasteful number, since it uses less digits than its factorization.

4322640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 4322640 is about 2079.0959573815. The cubic root of 4322640 is about 162.8982264552.

Adding to 4322640 its reverse (462234), we get a palindrome (4784874).

The spelling of 4322640 in words is "four million, three hundred twenty-two thousand, six hundred forty".