1020040 has 32 divisors (see below), whose sum is σ = 2623680. Its totient is φ = 349632.

The previous prime is 1020037. The next prime is 1020043. The reversal of 1020040 is 400201.

It is an interprime number because it is at equal distance from previous prime (1020037) and next prime (1020043).

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (1020043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1542 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (81990).

2^1020040 is an apocalyptic number.

1020040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020040 is an abundant number, since it is smaller than the sum of its proper divisors (1603640).

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

1020040 is a wasteful number, since it uses less digits than its factorization.

1020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3657 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 1020040 is about 1009.9702965929. The cubic root of 1020040 is about 100.6635867855.

Adding to 1020040 its reverse (400201), we get a palindrome (1420241).

The spelling of 1020040 in words is "one million, twenty thousand, forty".