1245221440 has 56 divisors (see below), whose sum is σ = 3139619832. Its totient is φ = 468787200.

The previous prime is 1245221429. The next prime is 1245221441. The reversal of 1245221440 is 441225421.

It can be written as a sum of positive squares in 4 ways, for example, as 548683776 + 696537664 = 23424^2 + 26392^2 .

It is not an unprimeable number, because it can be changed into a prime (1245221441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109011 + ... + 119890.

Almost surely, 2^1245221440 is an apocalyptic number.

1245221440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245221440 is an abundant number, since it is smaller than the sum of its proper divisors (1894398392).

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

1245221440 is a wasteful number, since it uses less digits than its factorization.

1245221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228935 (or 228925 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 1245221440 is about 35287.6953058711. The cubic root of 1245221440 is about 1075.8429127190.

Adding to 1245221440 its reverse (441225421), we get a palindrome (1686446861).

The spelling of 1245221440 in words is "one billion, two hundred forty-five million, two hundred twenty-one thousand, four hundred forty".