1405491 has 8 divisors (see below), whose sum is σ = 1880064. Its totient is φ = 933960.

The previous prime is 1405477. The next prime is 1405493. The reversal of 1405491 is 1945041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1405491 - 2⁷ = 1405363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1405493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750 + ... + 1836.

It is an arithmetic number, because the mean of its divisors is an integer number (235008).

2^1405491 is an apocalyptic number.

1405491 is a deficient number, since it is larger than the sum of its proper divisors (474573).

1405491 is a wasteful number, since it uses less digits than its factorization.

1405491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1405491 is about 1185.5340568706. The cubic root of 1405491 is about 112.0149586738.

The spelling of 1405491 in words is "one million, four hundred five thousand, four hundred ninety-one".