1020440240 has 40 divisors (see below), whose sum is σ = 2375606880. Its totient is φ = 407645696.

The previous prime is 1020440221. The next prime is 1020440243. The reversal of 1020440240 is 420440201.

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

It is a super-2 number, since 2×1020440240² = 2082596566822515200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1020440243) 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, 56837 + ... + 72603.

It is an arithmetic number, because the mean of its divisors is an integer number (59390172).

Almost surely, 2^1020440240 is an apocalyptic number.

1020440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020440240 is an abundant number, since it is smaller than the sum of its proper divisors (1355166640).

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

1020440240 is a wasteful number, since it uses less digits than its factorization.

1020440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16589 (or 16583 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 1020440240 is about 31944.3303263662. The cubic root of 1020440240 is about 1006.7675108152.

Adding to 1020440240 its reverse (420440201), we get a palindrome (1440880441).

The spelling of 1020440240 in words is "one billion, twenty million, four hundred forty thousand, two hundred forty".