1040781 has 16 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 573888.

The previous prime is 1040779. The next prime is 1040783. The reversal of 1040781 is 1870401.

It is an interprime number because it is at equal distance from previous prime (1040779) and next prime (1040783).

It is not a de Polignac number, because 1040781 - 2¹ = 1040779 is a prime.

It is a super-2 number, since 2×1040781² = 2166450179922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

1040781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1040783) 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, 246 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2^1040781 is an apocalyptic number.

It is an amenable number.

1040781 is a deficient number, since it is larger than the sum of its proper divisors (600819).

1040781 is a wasteful number, since it uses less digits than its factorization.

1040781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1040781 is about 1020.1867476105. The cubic root of 1040781 is about 101.3412954943.

The spelling of 1040781 in words is "one million, forty thousand, seven hundred eighty-one".