1056639 has 8 divisors (see below), whose sum is σ = 1441792. Its totient is φ = 687960.

The previous prime is 1056623. The next prime is 1056641. The reversal of 1056639 is 9366501.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1056639 - 2⁴ = 1056623 is a prime.

It is a super-2 number, since 2×1056639² = 2232971952642, which contains 22 as substring.

It is a Duffinian number.

1056639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056659) 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 7 ways as a sum of consecutive naturals, for example, 3967 + ... + 4224.

It is an arithmetic number, because the mean of its divisors is an integer number (180224).

2^1056639 is an apocalyptic number.

1056639 is a deficient number, since it is larger than the sum of its proper divisors (385153).

1056639 is an equidigital number, since it uses as much as digits as its factorization.

1056639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8237.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 1056639 is about 1027.9294722888. The cubic root of 1056639 is about 101.8534034038.

The spelling of 1056639 in words is "one million, fifty-six thousand, six hundred thirty-nine".