1278847440 has 800 divisors, whose sum is σ = 5444651520. Its totient is φ = 274710528.

The previous prime is 1278847429. The next prime is 1278847447. The reversal of 1278847440 is 447488721.

1278847440 is a `hidden beast` number, since 127 + 8 + 84 + 7 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278847447) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 27209497 + ... + 27209543.

Almost surely, 2^1278847440 is an apocalyptic number.

1278847440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278847440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2722325760).

1278847440 is an abundant number, since it is smaller than the sum of its proper divisors (4165804080).

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

1278847440 is a wasteful number, since it uses less digits than its factorization.

1278847440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 45.

The square root of 1278847440 is about 35760.9764967345. The cubic root of 1278847440 is about 1085.4410603199.

The spelling of 1278847440 in words is "one billion, two hundred seventy-eight million, eight hundred forty-seven thousand, four hundred forty".