1020525440 has 64 divisors (see below), whose sum is σ = 2661502320. Its totient is φ = 371097600.

The previous prime is 1020525439. The next prime is 1020525449. The reversal of 1020525440 is 445250201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020525449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65441 + ... + 79520.

Almost surely, 2^1020525440 is an apocalyptic number.

1020525440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020525440 is an abundant number, since it is smaller than the sum of its proper divisors (1640976880).

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

1020525440 is a wasteful number, since it uses less digits than its factorization.

1020525440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144991 (or 144979 counting only the distinct ones).

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

The square root of 1020525440 is about 31945.6638685127. The cubic root of 1020525440 is about 1006.7955295080.

Adding to 1020525440 its reverse (445250201), we get a palindrome (1465775641).

The spelling of 1020525440 in words is "one billion, twenty million, five hundred twenty-five thousand, four hundred forty".