1025131440 has 80 divisors (see below), whose sum is σ = 3287512800. Its totient is φ = 263940096.

The previous prime is 1025131403. The next prime is 1025131451. The reversal of 1025131440 is 441315201.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66685 + ... + 80604.

It is an arithmetic number, because the mean of its divisors is an integer number (41093910).

Almost surely, 2^1025131440 is an apocalyptic number.

1025131440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025131440 is an abundant number, since it is smaller than the sum of its proper divisors (2262381360).

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

1025131440 is a wasteful number, since it uses less digits than its factorization.

1025131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147334 (or 147328 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1025131440 is about 32017.6738692866. The cubic root of 1025131440 is about 1008.3079337606.

Adding to 1025131440 its reverse (441315201), we get a palindrome (1466446641).

The spelling of 1025131440 in words is "one billion, twenty-five million, one hundred thirty-one thousand, four hundred forty".