1000533440 has 28 divisors (see below), whose sum is σ = 2382521016. Its totient is φ = 400213248.

The previous prime is 1000533433. The next prime is 1000533449. The reversal of 1000533440 is 443350001.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000533449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1563014 + ... + 1563653.

Almost surely, 2^1000533440 is an apocalyptic number.

1000533440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000533440 is an abundant number, since it is smaller than the sum of its proper divisors (1381987576).

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

1000533440 is an equidigital number, since it uses as much as digits as its factorization.

1000533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126684 (or 3126674 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1000533440 is about 31631.2099041437. The cubic root of 1000533440 is about 1000.1777817251.

Adding to 1000533440 its reverse (443350001), we get a palindrome (1443883441).

The spelling of 1000533440 in words is "one billion, five hundred thirty-three thousand, four hundred forty".