1538720 has 48 divisors (see below), whose sum is σ = 3719520. Its totient is φ = 601344.

The previous prime is 1538701. The next prime is 1538731. The reversal of 1538720 is 278351.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1538720.

It is an unprimeable 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, 9359 + ... + 9521.

It is an arithmetic number, because the mean of its divisors is an integer number (77490).

2^1538720 is an apocalyptic number.

1538720 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 1538720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1859760).

1538720 is an abundant number, since it is smaller than the sum of its proper divisors (2180800).

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

1538720 is a wasteful number, since it uses less digits than its factorization.

1538720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1538720 is about 1240.4515306936. The cubic root of 1538720 is about 115.4480316922.

The spelling of 1538720 in words is "one million, five hundred thirty-eight thousand, seven hundred twenty".