1025540040 has 128 divisors (see below), whose sum is σ = 3522504960. Its totient is φ = 233985024.

The previous prime is 1025540023. The next prime is 1025540053. The reversal of 1025540040 is 400455201.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1025539989 and 1025540016.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 917562 + ... + 918678.

It is an arithmetic number, because the mean of its divisors is an integer number (27519570).

Almost surely, 2^1025540040 is an apocalyptic number.

1025540040 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 1025540040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761252480).

1025540040 is an abundant number, since it is smaller than the sum of its proper divisors (2496964920).

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

1025540040 is a wasteful number, since it uses less digits than its factorization.

1025540040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231 (or 2227 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1025540040 is about 32024.0540843910. The cubic root of 1025540040 is about 1008.4418807777.

Adding to 1025540040 its reverse (400455201), we get a palindrome (1425995241).

The spelling of 1025540040 in words is "one billion, twenty-five million, five hundred forty thousand, forty".