1057639 has 4 divisors (see below), whose sum is σ = 1153800. Its totient is φ = 961480.

The previous prime is 1057633. The next prime is 1057643. The reversal of 1057639 is 9367501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1057639 - 2³ = 1057631 is a prime.

It is a super-2 number, since 2×1057639² = 2237200508642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1057639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48064 + ... + 48085.

It is an arithmetic number, because the mean of its divisors is an integer number (288450).

2^1057639 is an apocalyptic number.

1057639 is a deficient number, since it is larger than the sum of its proper divisors (96161).

1057639 is an equidigital number, since it uses as much as digits as its factorization.

1057639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96160.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 1057639 is about 1028.4157719522. The cubic root of 1057639 is about 101.8855245252.

It can be divided in two parts, 105 and 7639, that added together give a square (7744 = 88²).

The spelling of 1057639 in words is "one million, fifty-seven thousand, six hundred thirty-nine".