1001442440 has 16 divisors (see below), whose sum is σ = 2253245580. Its totient is φ = 400576960.

The previous prime is 1001442401. The next prime is 1001442451. The reversal of 1001442440 is 442441001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 942121636 + 59320804 = 30694^2 + 7702^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12517991 + ... + 12518070.

Almost surely, 2^1001442440 is an apocalyptic number.

1001442440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001442440 is an abundant number, since it is smaller than the sum of its proper divisors (1251803140).

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

1001442440 is a wasteful number, since it uses less digits than its factorization.

1001442440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25036072 (or 25036068 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1001442440 is about 31645.5753621261. The cubic root of 1001442440 is about 1000.4805823370.

Adding to 1001442440 its reverse (442441001), we get a palindrome (1443883441).

The spelling of 1001442440 in words is "one billion, one million, four hundred forty-two thousand, four hundred forty".