1405881 has 12 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 906840.

The previous prime is 1405879. The next prime is 1405919. The reversal of 1405881 is 1885041.

It is not a de Polignac number, because 1405881 - 2¹ = 1405879 is a prime.

It is a super-2 number, since 2×1405881² = 3953002772322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1405801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2241 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (174720).

2^1405881 is an apocalyptic number.

It is an amenable number.

1405881 is a deficient number, since it is larger than the sum of its proper divisors (690759).

1405881 is a wasteful number, since it uses less digits than its factorization.

1405881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076 (or 5073 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1405881 is about 1185.6985282946. The cubic root of 1405881 is about 112.0253184683.

The spelling of 1405881 in words is "one million, four hundred five thousand, eight hundred eighty-one".