1572640 has 24 divisors (see below), whose sum is σ = 3715740. Its totient is φ = 628992.

The previous prime is 1572629. The next prime is 1572643. The reversal of 1572640 is 462751.

It can be written as a sum of positive squares in 2 ways, for example, as 1527696 + 44944 = 1236^2 + 212^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1572643) 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 3 ways as a sum of consecutive naturals, for example, 4755 + ... + 5074.

2^1572640 is an apocalyptic number.

1572640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1572640 is an abundant number, since it is smaller than the sum of its proper divisors (2143100).

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

1572640 is an equidigital number, since it uses as much as digits as its factorization.

1572640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9844 (or 9836 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1572640 is about 1254.0494408116. The cubic root of 1572640 is about 116.2901969135.

The spelling of 1572640 in words is "one million, five hundred seventy-two thousand, six hundred forty".