1021040 has 20 divisors (see below), whose sum is σ = 2374104. Its totient is φ = 408384.

The previous prime is 1021019. The next prime is 1021043. The reversal of 1021040 is 401201.

1021040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021043) 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, 6302 + ... + 6461.

2^1021040 is an apocalyptic number.

1021040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021040 is an abundant number, since it is smaller than the sum of its proper divisors (1353064).

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

1021040 is a wasteful number, since it uses less digits than its factorization.

1021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12776 (or 12770 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1021040 is about 1010.4652393823. The cubic root of 1021040 is about 100.6964713486.

Adding to 1021040 its reverse (401201), we get a palindrome (1422241).

The spelling of 1021040 in words is "one million, twenty-one thousand, forty".