1405906 has 8 divisors (see below), whose sum is σ = 2115324. Its totient is φ = 700800.

The previous prime is 1405879. The next prime is 1405919. The reversal of 1405906 is 6095041.

It can be written as a sum of positive squares in 2 ways, for example, as 1404225 + 1681 = 1185^2 + 41^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75 + ... + 1678.

2^1405906 is an apocalyptic number.

1405906 is a deficient number, since it is larger than the sum of its proper divisors (709418).

1405906 is a wasteful number, since it uses less digits than its factorization.

1405906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1405906 is about 1185.7090705565. The cubic root of 1405906 is about 112.0259824924.

The spelling of 1405906 in words is "one million, four hundred five thousand, nine hundred six".