1057720 has 32 divisors (see below), whose sum is σ = 2459520. Its totient is φ = 408960.

The previous prime is 1057703. The next prime is 1057739. The reversal of 1057720 is 277501.

It is a super-2 number, since 2×1057720² = 2237543196800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1057691 and 1057700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (76860).

2^1057720 is an apocalyptic number.

1057720 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 1057720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229760).

1057720 is an abundant number, since it is smaller than the sum of its proper divisors (1401800).

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

1057720 is a wasteful number, since it uses less digits than its factorization.

1057720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 891 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 1057720 is about 1028.4551521578. The cubic root of 1057720 is about 101.8881254495. Note that the first 3 decimals are identical.

The spelling of 1057720 in words is "one million, fifty-seven thousand, seven hundred twenty".