1978720 has 48 divisors (see below), whose sum is σ = 4762800. Its totient is φ = 776704.

The previous prime is 1978709. The next prime is 1978727. The reversal of 1978720 is 278791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13206 + ... + 13354.

It is an arithmetic number, because the mean of its divisors is an integer number (99225).

2^1978720 is an apocalyptic number.

1978720 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 1978720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2381400).

1978720 is an abundant number, since it is smaller than the sum of its proper divisors (2784080).

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

1978720 is a wasteful number, since it uses less digits than its factorization.

1978720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1978720 is about 1406.6698262208. The cubic root of 1978720 is about 125.5436587203.

The spelling of 1978720 in words is "one million, nine hundred seventy-eight thousand, seven hundred twenty".