1023720 has 64 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 258048.

The previous prime is 1023719. The next prime is 1023721. The reversal of 1023720 is 273201.

It is an interprime number because it is at equal distance from previous prime (1023719) and next prime (1023721).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1023720.

It is not an unprimeable number, because it can be changed into a prime (1023721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2056 + ... + 2504.

It is an arithmetic number, because the mean of its divisors is an integer number (50625).

2^1023720 is an apocalyptic number.

1023720 is a gapful number since it is divisible by the number (10) 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 1023720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1620000).

1023720 is an abundant number, since it is smaller than the sum of its proper divisors (2216280).

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

1023720 is a wasteful number, since it uses less digits than its factorization.

1023720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 1023720 is about 1011.7904921475. The cubic root of 1023720 is about 100.7844962298.

Adding to 1023720 its reverse (273201), we get a palindrome (1296921).

The spelling of 1023720 in words is "one million, twenty-three thousand, seven hundred twenty".