1023533440 has 32 divisors (see below), whose sum is σ = 2446886160. Its totient is φ = 409413120.

The previous prime is 1023533411. The next prime is 1023533447. The reversal of 1023533440 is 443353201.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023533447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798996 + ... + 800275.

Almost surely, 2^1023533440 is an apocalyptic number.

1023533440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023533440 is an abundant number, since it is smaller than the sum of its proper divisors (1423352720).

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

1023533440 is an equidigital number, since it uses as much as digits as its factorization.

1023533440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599290 (or 1599278 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 1023533440 is about 31992.7091694342. The cubic root of 1023533440 is about 1007.7837362534.

Adding to 1023533440 its reverse (443353201), we get a palindrome (1466886641).

The spelling of 1023533440 in words is "one billion, twenty-three million, five hundred thirty-three thousand, four hundred forty".