1408691 has 4 divisors (see below), whose sum is σ = 1415232. Its totient is φ = 1402152.

The previous prime is 1408669. The next prime is 1408697. The reversal of 1408691 is 1968041.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1408691 - 2¹⁰ = 1407667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1408697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2936 + ... + 3381.

It is an arithmetic number, because the mean of its divisors is an integer number (353808).

2^1408691 is an apocalyptic number.

1408691 is a deficient number, since it is larger than the sum of its proper divisors (6541).

1408691 is an equidigital number, since it uses as much as digits as its factorization.

1408691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1408691 is about 1186.8828922855. The cubic root of 1408691 is about 112.0999055418.

The spelling of 1408691 in words is "one million, four hundred eight thousand, six hundred ninety-one".