1042649 has 4 divisors (see below), whose sum is σ = 1046964. Its totient is φ = 1038336.

The previous prime is 1042633. The next prime is 1042681. The reversal of 1042649 is 9462401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9462401 = 13 ⋅727877.

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 196249 = 920^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042649 - 2⁴ = 1042633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1042609) 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, 1772 + ... + 2285.

It is an arithmetic number, because the mean of its divisors is an integer number (261741).

2^1042649 is an apocalyptic number.

It is an amenable number.

1042649 is a deficient number, since it is larger than the sum of its proper divisors (4315).

1042649 is an equidigital number, since it uses as much as digits as its factorization.

1042649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1042649 is about 1021.1018558401. The cubic root of 1042649 is about 101.4018885801.

The spelling of 1042649 in words is "one million, forty-two thousand, six hundred forty-nine".