1022420 has 48 divisors (see below), whose sum is σ = 2513280. Its totient is φ = 342144.

The previous prime is 1022389. The next prime is 1022429. The reversal of 1022420 is 242201.

1022420 = T₂₂₄ + T₂₂₅ + ... + T₂₅₈.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9326 + ... + 9434.

It is an arithmetic number, because the mean of its divisors is an integer number (52360).

2^1022420 is an apocalyptic number.

1022420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1022420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1256640).

1022420 is an abundant number, since it is smaller than the sum of its proper divisors (1490860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1022420 is a wasteful number, since it uses less digits than its factorization.

1022420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 1022420 is about 1011.1478625799. The cubic root of 1022420 is about 100.7418168044.

Adding to 1022420 its reverse (242201), we get a palindrome (1264621).

It can be divided in two parts, 10224 and 20, that multiplied together give a triangular number (204480 = T₆₃₉).

The spelling of 1022420 in words is "one million, twenty-two thousand, four hundred twenty".