1022640 has 40 divisors (see below), whose sum is σ = 3170928. Its totient is φ = 272640.

The previous prime is 1022639. The next prime is 1022653. The reversal of 1022640 is 462201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891 + ... + 2370.

2^1022640 is an apocalyptic number.

1022640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022640 is an abundant number, since it is smaller than the sum of its proper divisors (2148288).

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

1022640 is a wasteful number, since it uses less digits than its factorization.

1022640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4277 (or 4271 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1022640 is about 1011.2566439831. The cubic root of 1022640 is about 100.7490420185.

Adding to 1022640 its reverse (462201), we get a palindrome (1484841).

The spelling of 1022640 in words is "one million, twenty-two thousand, six hundred forty".