1278833240 has 16 divisors (see below), whose sum is σ = 2877374880. Its totient is φ = 511533280.

The previous prime is 1278833239. The next prime is 1278833243. The reversal of 1278833240 is 423388721.

It is a junction number, because it is equal to n+sod(n) for n = 1278833194 and 1278833203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278833243) 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, 15985376 + ... + 15985455.

It is an arithmetic number, because the mean of its divisors is an integer number (179835930).

Almost surely, 2^1278833240 is an apocalyptic number.

1278833240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278833240 is an abundant number, since it is smaller than the sum of its proper divisors (1598541640).

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

1278833240 is a wasteful number, since it uses less digits than its factorization.

1278833240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31970842 (or 31970838 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 1278833240 is about 35760.7779557436. Note that the first 3 decimals coincide. The cubic root of 1278833240 is about 1085.4370428170.

The spelling of 1278833240 in words is "one billion, two hundred seventy-eight million, eight hundred thirty-three thousand, two hundred forty".