1251217040 has 40 divisors (see below), whose sum is σ = 3002926848. Its totient is φ = 484341120.

The previous prime is 1251216973. The next prime is 1251217061. The reversal of 1251217040 is 407121521.

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

It is a junction number, because it is equal to n+sod(n) for n = 1251216997 and 1251217015.

It is an unprimeable number.

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, 249782 + ... + 254741.

Almost surely, 2^1251217040 is an apocalyptic number.

1251217040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251217040 is an abundant number, since it is smaller than the sum of its proper divisors (1751709808).

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

1251217040 is a wasteful number, since it uses less digits than its factorization.

1251217040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504567 (or 504561 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1251217040 is about 35372.5464166774. The cubic root of 1251217040 is about 1077.5668360413.

Adding to 1251217040 its reverse (407121521), we get a palindrome (1658338561).

The spelling of 1251217040 in words is "one billion, two hundred fifty-one million, two hundred seventeen thousand, forty".