1005406 has 4 divisors (see below), whose sum is σ = 1508112. Its totient is φ = 502702.

The previous prime is 1005391. The next prime is 1005409. The reversal of 1005406 is 6045001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6045001 = 79 ⋅76519.

It is a self number, because there is not a number n which added to its sum of digits gives 1005406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251350 + ... + 251353.

It is an arithmetic number, because the mean of its divisors is an integer number (377028).

2^1005406 is an apocalyptic number.

1005406 is a deficient number, since it is larger than the sum of its proper divisors (502706).

1005406 is an equidigital number, since it uses as much as digits as its factorization.

1005406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502705.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1005406 is about 1002.6993567366. The cubic root of 1005406 is about 100.1798762513.

The spelling of 1005406 in words is "one million, five thousand, four hundred six".