1025253640 has 32 divisors (see below), whose sum is σ = 2307994560. Its totient is φ = 409892800.

The previous prime is 1025253637. The next prime is 1025253641. The reversal of 1025253640 is 463525201.

It is a super-2 number, since 2×1025253640² = 2102290052666499200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1025253599 and 1025253608.

It is not an unprimeable number, because it can be changed into a prime (1025253641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91125 + ... + 101755.

It is an arithmetic number, because the mean of its divisors is an integer number (72124830).

Almost surely, 2^1025253640 is an apocalyptic number.

1025253640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025253640 is an abundant number, since it is smaller than the sum of its proper divisors (1282740920).

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

1025253640 is a wasteful number, since it uses less digits than its factorization.

1025253640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13053 (or 13049 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1025253640 is about 32019.5821334383. The cubic root of 1025253640 is about 1008.3479970243.

Adding to 1025253640 its reverse (463525201), we get a palindrome (1488778841).

The spelling of 1025253640 in words is "one billion, twenty-five million, two hundred fifty-three thousand, six hundred forty".