1404781 has 6 divisors (see below), whose sum is σ = 1634190. Its totient is φ = 1204056.

The previous prime is 1404763. The next prime is 1404791. The reversal of 1404781 is 1874041.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 70756 = 1155^2 + 266^2 .

It is not a de Polignac number, because 1404781 - 2⁵ = 1404749 is a prime.

It is a super-2 number, since 2×1404781² = 3946819315922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1404721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14286 + ... + 14383.

It is an arithmetic number, because the mean of its divisors is an integer number (272365).

2^1404781 is an apocalyptic number.

It is an amenable number.

1404781 is a deficient number, since it is larger than the sum of its proper divisors (229409).

1404781 is an equidigital number, since it uses as much as digits as its factorization.

1404781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28683 (or 28676 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 1404781 is about 1185.2345759385. The cubic root of 1404781 is about 111.9960936138.

The spelling of 1404781 in words is "one million, four hundred four thousand, seven hundred eighty-one".