1022405 has 4 divisors (see below), whose sum is σ = 1226892. Its totient is φ = 817920.

The previous prime is 1022389. The next prime is 1022429. The reversal of 1022405 is 5042201.

1022405 = T₆₃₇ + T₆₃₈ + ... + T₆₄₁.

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

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 410881 = 782^2 + 641^2 .

It is not a de Polignac number, because 1022405 - 2⁴ = 1022389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1022405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102236 + ... + 102245.

It is an arithmetic number, because the mean of its divisors is an integer number (306723).

2^1022405 is an apocalyptic number.

It is an amenable number.

1022405 is a deficient number, since it is larger than the sum of its proper divisors (204487).

1022405 is an equidigital number, since it uses as much as digits as its factorization.

1022405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204486.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1022405 is about 1011.1404452399. The cubic root of 1022405 is about 100.7413241384.

Adding to 1022405 its reverse (5042201), we get a palindrome (6064606).

The spelling of 1022405 in words is "one million, twenty-two thousand, four hundred five".