1020440 has 32 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 402432.

The previous prime is 1020431. The next prime is 1020451. The reversal of 1020440 is 440201.

1020440 = 245² + 246² + ... + 260².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3749 + ... + 4011.

It is an arithmetic number, because the mean of its divisors is an integer number (72765).

2^1020440 is an apocalyptic number.

1020440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020440 is an abundant number, since it is smaller than the sum of its proper divisors (1308040).

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

1020440 is a wasteful number, since it uses less digits than its factorization.

1020440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 367 counting only the distinct ones).

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

The square root of 1020440 is about 1010.1683028090. The cubic root of 1020440 is about 100.6767431887.

Adding to 1020440 its reverse (440201), we get a palindrome (1460641).

The spelling of 1020440 in words is "one million, twenty thousand, four hundred forty".