1623403 has 2 divisors, whose sum is σ = 1623404. Its totient is φ = 1623402.

The previous prime is 1623367. The next prime is 1623421. The reversal of 1623403 is 3043261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1623403 - 2¹⁷ = 1492331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811701 + 811702.

It is an arithmetic number, because the mean of its divisors is an integer number (811702).

2^1623403 is an apocalyptic number.

1623403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623403 is an equidigital number, since it uses as much as digits as its factorization.

1623403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1623403 is about 1274.1283294865. The cubic root of 1623403 is about 117.5282081061.

Adding to 1623403 its reverse (3043261), we get a palindrome (4666664).

The spelling of 1623403 in words is "one million, six hundred twenty-three thousand, four hundred three".