1025421640 has 64 divisors (see below), whose sum is σ = 2571523200. Its totient is φ = 365718528.

The previous prime is 1025421601. The next prime is 1025421647. The reversal of 1025421640 is 461245201.

It is a happy number.

1025421640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1025421647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26764 + ... + 52603.

It is an arithmetic number, because the mean of its divisors is an integer number (40180050).

Almost surely, 2^1025421640 is an apocalyptic number.

1025421640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025421640 is an abundant number, since it is smaller than the sum of its proper divisors (1546101560).

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

1025421640 is a wasteful number, since it uses less digits than its factorization.

1025421640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79414 (or 79410 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1025421640 is about 32022.2054206140. The cubic root of 1025421640 is about 1008.4030706194.

Adding to 1025421640 its reverse (461245201), we get a palindrome (1486666841).

The spelling of 1025421640 in words is "one billion, twenty-five million, four hundred twenty-one thousand, six hundred forty".