1906405 has 8 divisors (see below), whose sum is σ = 2341152. Its totient is φ = 1489488.

The previous prime is 1906393. The next prime is 1906417. The reversal of 1906405 is 5046091.

It is an interprime number because it is at equal distance from previous prime (1906393) and next prime (1906417).

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

It is a cyclic number.

It is not a de Polignac number, because 1906405 - 2¹⁵ = 1873637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1906405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4219 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (292644).

2^1906405 is an apocalyptic number.

It is an amenable number.

1906405 is a deficient number, since it is larger than the sum of its proper divisors (434747).

1906405 is an equidigital number, since it uses as much as digits as its factorization.

1906405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8915.

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

The square root of 1906405 is about 1380.7262581700. The cubic root of 1906405 is about 123.9952521595.

The spelling of 1906405 in words is "one million, nine hundred six thousand, four hundred five".