1012251440 has 40 divisors (see below), whose sum is σ = 2358294000. Its totient is φ = 404073216.

The previous prime is 1012251437. The next prime is 1012251497. The reversal of 1012251440 is 441522101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27242 + ... + 52598.

It is an arithmetic number, because the mean of its divisors is an integer number (58957350).

Almost surely, 2^1012251440 is an apocalyptic number.

1012251440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012251440 is an abundant number, since it is smaller than the sum of its proper divisors (1346042560).

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

1012251440 is a wasteful number, since it uses less digits than its factorization.

1012251440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25869 (or 25863 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1012251440 is about 31815.8991700690. The cubic root of 1012251440 is about 1004.0672483963.

Adding to 1012251440 its reverse (441522101), we get a palindrome (1453773541).

The spelling of 1012251440 in words is "one billion, twelve million, two hundred fifty-one thousand, four hundred forty".