1206403 has 4 divisors (see below), whose sum is σ = 1316088. Its totient is φ = 1096720.

The previous prime is 1206391. The next prime is 1206407. The reversal of 1206403 is 3046021.

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 1206403 - 2⁹ = 1205891 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1206407) 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, 54826 + ... + 54847.

It is an arithmetic number, because the mean of its divisors is an integer number (329022).

2^1206403 is an apocalyptic number.

1206403 is a deficient number, since it is larger than the sum of its proper divisors (109685).

1206403 is a wasteful number, since it uses less digits than its factorization.

1206403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109684.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1206403 is about 1098.3637830883. The cubic root of 1206403 is about 106.4545273776.

The spelling of 1206403 in words is "one million, two hundred six thousand, four hundred three".