1023406 has 4 divisors (see below), whose sum is σ = 1535112. Its totient is φ = 511702.

The previous prime is 1023391. The next prime is 1023409. The reversal of 1023406 is 6043201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6043201 = 1409 ⋅4289.

It is a self number, because there is not a number n which added to its sum of digits gives 1023406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255850 + ... + 255853.

It is an arithmetic number, because the mean of its divisors is an integer number (383778).

2^1023406 is an apocalyptic number.

1023406 is a deficient number, since it is larger than the sum of its proper divisors (511706).

1023406 is an equidigital number, since it uses as much as digits as its factorization.

1023406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511705.

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

The square root of 1023406 is about 1011.6353097831. The cubic root of 1023406 is about 100.7741908182.

Adding to 1023406 its reverse (6043201), we get a palindrome (7066607).

The spelling of 1023406 in words is "one million, twenty-three thousand, four hundred six".