1245450840 has 64 divisors (see below), whose sum is σ = 3739154400. Its totient is φ = 331871232.

The previous prime is 1245450827. The next prime is 1245450911. The reversal of 1245450840 is 480545421.

It is a happy number.

It is a super-2 number, since 2×1245450840² = 3102295589713411200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202044 + ... + 208116.

Almost surely, 2^1245450840 is an apocalyptic number.

1245450840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245450840 is an abundant number, since it is smaller than the sum of its proper divisors (2493703560).

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

1245450840 is a wasteful number, since it uses less digits than its factorization.

1245450840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7796 (or 7792 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

The square root of 1245450840 is about 35290.9455809844. The cubic root of 1245450840 is about 1075.9089741178.

The spelling of 1245450840 in words is "one billion, two hundred forty-five million, four hundred fifty thousand, eight hundred forty".