1015042440 has 128 divisors (see below), whose sum is σ = 3230150400. Its totient is φ = 254622720.

The previous prime is 1015042421. The next prime is 1015042447. The reversal of 1015042440 is 442405101.

It is a happy number.

It is a super-2 number, since 2×1015042440² = 2060622310002307200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1015042447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165346 + ... + 171374.

It is an arithmetic number, because the mean of its divisors is an integer number (25235550).

Almost surely, 2^1015042440 is an apocalyptic number.

1015042440 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 1015042440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1615075200).

1015042440 is an abundant number, since it is smaller than the sum of its proper divisors (2215107960).

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

1015042440 is a wasteful number, since it uses less digits than its factorization.

1015042440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127 (or 6123 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1015042440 is about 31859.7306956603. The cubic root of 1015042440 is about 1004.9892130225.

Adding to 1015042440 its reverse (442405101), we get a palindrome (1457447541).

The spelling of 1015042440 in words is "one billion, fifteen million, forty-two thousand, four hundred forty".