1022440 has 16 divisors (see below), whose sum is σ = 2300580. Its totient is φ = 408960.

The previous prime is 1022429. The next prime is 1022443. The reversal of 1022440 is 442201.

It can be written as a sum of positive squares in 2 ways, for example, as 1012036 + 10404 = 1006^2 + 102^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1022440.

It is not an unprimeable number, because it can be changed into a prime (1022443) 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, 12741 + ... + 12820.

2^1022440 is an apocalyptic number.

1022440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022440 is an abundant number, since it is smaller than the sum of its proper divisors (1278140).

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

1022440 is a wasteful number, since it uses less digits than its factorization.

1022440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25572 (or 25568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1022440 is about 1011.1577522820. The cubic root of 1022440 is about 100.7424736849.

Adding to 1022440 its reverse (442201), we get a palindrome (1464641).

The spelling of 1022440 in words is "one million, twenty-two thousand, four hundred forty".