1406781 has 8 divisors (see below), whose sum is σ = 2084160. Its totient is φ = 937836.

The previous prime is 1406773. The next prime is 1406789. The reversal of 1406781 is 1876041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1406773) and next prime (1406789).

It is not a de Polignac number, because 1406781 - 2³ = 1406773 is a prime.

It is a super-2 number, since 2×1406781² = 3958065563922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 52103 = 1406781 / (1 + 4 + 0 + 6 + 7 + 8 + 1).

It is a Curzon number.

1406781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26025 + ... + 26078.

It is an arithmetic number, because the mean of its divisors is an integer number (260520).

2^1406781 is an apocalyptic number.

It is an amenable number.

1406781 is a deficient number, since it is larger than the sum of its proper divisors (677379).

1406781 is an equidigital number, since it uses as much as digits as its factorization.

1406781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52112 (or 52106 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1406781 is about 1186.0779906903. The cubic root of 1406781 is about 112.0492183763.

It can be divided in two parts, 1406 and 781, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1406781 in words is "one million, four hundred six thousand, seven hundred eighty-one".