1040021520 has 40 divisors (see below), whose sum is σ = 3224067456. Its totient is φ = 277339008.

The previous prime is 1040021483. The next prime is 1040021551. The reversal of 1040021520 is 251200401.

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

It is a super-2 number, since 2×1040021520² = 2163289524126220800, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1040021520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2166472 + ... + 2166951.

Almost surely, 2^1040021520 is an apocalyptic number.

1040021520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1040021520 is an abundant number, since it is smaller than the sum of its proper divisors (2184045936).

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

1040021520 is a wasteful number, since it uses less digits than its factorization.

1040021520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333439 (or 4333433 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1040021520 is about 32249.3646449042. The cubic root of 1040021520 is about 1013.1663919740.

Adding to 1040021520 its reverse (251200401), we get a palindrome (1291221921).

The spelling of 1040021520 in words is "one billion, forty million, twenty-one thousand, five hundred twenty".