1040991 has 16 divisors (see below), whose sum is σ = 1670400. Its totient is φ = 563328.

The previous prime is 1040989. The next prime is 1041041. The reversal of 1040991 is 1990401.

It is not a de Polignac number, because 1040991 - 2¹ = 1040989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (104400).

2^1040991 is an apocalyptic number.

1040991 is a deficient number, since it is larger than the sum of its proper divisors (629409).

1040991 is a wasteful number, since it uses less digits than its factorization.

1040991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1040991 is about 1020.2896647521. The cubic root of 1040991 is about 101.3481109662.

The spelling of 1040991 in words is "one million, forty thousand, nine hundred ninety-one".