1021423 has 4 divisors (see below), whose sum is σ = 1100008. Its totient is φ = 942840.

The previous prime is 1021417. The next prime is 1021429. The reversal of 1021423 is 3241201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1021417) and next prime (1021429).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 78571 = 1021423 / (1 + 0 + 2 + 1 + 4 + 2 + 3).

1021423 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021429) 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, 39273 + ... + 39298.

It is an arithmetic number, because the mean of its divisors is an integer number (275002).

2^1021423 is an apocalyptic number.

1021423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1021423 is a deficient number, since it is larger than the sum of its proper divisors (78585).

1021423 is an equidigital number, since it uses as much as digits as its factorization.

1021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78584.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1021423 is about 1010.6547382761. The cubic root of 1021423 is about 100.7090604497.

Adding to 1021423 its reverse (3241201), we get a palindrome (4262624).

It can be divided in two parts, 1021 and 423, that added together give a square (1444 = 38²).

The spelling of 1021423 in words is "one million, twenty-one thousand, four hundred twenty-three".