1422405 has 24 divisors (see below), whose sum is σ = 2505048. Its totient is φ = 746496.

The previous prime is 1422367. The next prime is 1422409. The reversal of 1422405 is 5042241.

It can be written as a sum of positive squares in 4 ways, for example, as 25281 + 1397124 = 159^2 + 1182^2 .

It is not a de Polignac number, because 1422405 - 2⁷ = 1422277 is a prime.

It is an Ulam number.

1422405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1422409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3069 + ... + 3501.

It is an arithmetic number, because the mean of its divisors is an integer number (104377).

2^1422405 is an apocalyptic number.

1422405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1422405 is a deficient number, since it is larger than the sum of its proper divisors (1082643).

1422405 is a wasteful number, since it uses less digits than its factorization.

1422405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1422405 is about 1192.6462174509. The cubic root of 1422405 is about 112.4625060239.

Adding to 1422405 its reverse (5042241), we get a palindrome (6464646).

The spelling of 1422405 in words is "one million, four hundred twenty-two thousand, four hundred five".