1245440778 has 8 divisors (see below), whose sum is σ = 2490881568. Its totient is φ = 415146924.

The previous prime is 1245440771. The next prime is 1245440803. The reversal of 1245440778 is 8770445421.

It is a sphenic number, since it is the product of 3 distinct primes.

1245440778 is an admirable number.

It is a super-3 number, since 3×1245440778³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1245440771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103786726 + ... + 103786737.

It is an arithmetic number, because the mean of its divisors is an integer number (311360196).

Almost surely, 2^1245440778 is an apocalyptic number.

1245440778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1245440778 is a wasteful number, since it uses less digits than its factorization.

1245440778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207573468.

The product of its (nonzero) digits is 250880, while the sum is 42.

The square root of 1245440778 is about 35290.8030228840. The cubic root of 1245440778 is about 1075.9060766863.

The spelling of 1245440778 in words is "one billion, two hundred forty-five million, four hundred forty thousand, seven hundred seventy-eight".