1057667 has 4 divisors (see below), whose sum is σ = 1139040. Its totient is φ = 976296.

The previous prime is 1057663. The next prime is 1057681. The reversal of 1057667 is 7667501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7667501 = 2593 ⋅2957.

It is a cyclic number.

It is not a de Polignac number, because 1057667 - 2² = 1057663 is a prime.

It is a super-2 number, since 2×1057667² = 2237318965778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1057663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40667 + ... + 40692.

It is an arithmetic number, because the mean of its divisors is an integer number (284760).

2^1057667 is an apocalyptic number.

1057667 is a deficient number, since it is larger than the sum of its proper divisors (81373).

1057667 is an equidigital number, since it uses as much as digits as its factorization.

1057667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81372.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 1057667 is about 1028.4293850333. The cubic root of 1057667 is about 101.8864236252.

The spelling of 1057667 in words is "one million, fifty-seven thousand, six hundred sixty-seven".