1025540240 has 80 divisors (see below), whose sum is σ = 2420226048. Its totient is φ = 404103168.

The previous prime is 1025540237. The next prime is 1025540251. The reversal of 1025540240 is 420455201.

It is a happy number.

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, 1960619 + ... + 1961141.

Almost surely, 2^1025540240 is an apocalyptic number.

1025540240 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 1025540240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210113024).

1025540240 is an abundant number, since it is smaller than the sum of its proper divisors (1394685808).

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

1025540240 is a wasteful number, since it uses less digits than its factorization.

1025540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1025540240 is about 32024.0572070436. The cubic root of 1025540240 is about 1008.4419463329.

Adding to 1025540240 its reverse (420455201), we get a palindrome (1445995441).

The spelling of 1025540240 in words is "one billion, twenty-five million, five hundred forty thousand, two hundred forty".