1040391 has 32 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 604800.

The previous prime is 1040387. The next prime is 1040407. The reversal of 1040391 is 1930401.

1040391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1040391 - 2² = 1040387 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9151 + ... + 9263.

It is an arithmetic number, because the mean of its divisors is an integer number (54720).

2^1040391 is an apocalyptic number.

1040391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1040391 is a deficient number, since it is larger than the sum of its proper divisors (710649).

1040391 is a wasteful number, since it uses less digits than its factorization.

1040391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1040391 is about 1019.9955882258. The cubic root of 1040391 is about 101.3286357568.

Adding to 1040391 its reverse (1930401), we get a palindrome (2970792).

It can be divided in two parts, 1040 and 391, that added together give a triangular number (1431 = T₅₃).

The spelling of 1040391 in words is "one million, forty thousand, three hundred ninety-one".