1040405 has 16 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 779328.

The previous prime is 1040387. The next prime is 1040407. The reversal of 1040405 is 5040401.

1040405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1040405 - 2¹⁴ = 1024021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1040405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040407) 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, 9491 + ... + 9599.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2^1040405 is an apocalyptic number.

It is an amenable number.

1040405 is a deficient number, since it is larger than the sum of its proper divisors (290155).

1040405 is a wasteful number, since it uses less digits than its factorization.

1040405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1040405 is about 1020.0024509774. The cubic root of 1040405 is about 101.3290902636.

Adding to 1040405 its reverse (5040401), we get a palindrome (6080806).

The spelling of 1040405 in words is "one million, forty thousand, four hundred five".