1002022440 has 64 divisors (see below), whose sum is σ = 3017856960. Its totient is φ = 266158080.

The previous prime is 1002022403. The next prime is 1002022447. The reversal of 1002022440 is 442202001.

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

It is not an unprimeable number, because it can be changed into a prime (1002022447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14595 + ... + 47085.

It is an arithmetic number, because the mean of its divisors is an integer number (47154015).

Almost surely, 2^1002022440 is an apocalyptic number.

1002022440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1002022440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1508928480).

1002022440 is an abundant number, since it is smaller than the sum of its proper divisors (2015834520).

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

1002022440 is a wasteful number, since it uses less digits than its factorization.

1002022440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32762 (or 32758 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1002022440 is about 31654.7380339816. The cubic root of 1002022440 is about 1000.6736927029.

Adding to 1002022440 its reverse (442202001), we get a palindrome (1444224441).

The spelling of 1002022440 in words is "one billion, two million, twenty-two thousand, four hundred forty".