1278260990 has 16 divisors (see below), whose sum is σ = 2305912752. Its totient is φ = 510183744.

The previous prime is 1278260983. The next prime is 1278260993. The reversal of 1278260990 is 990628721.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278260993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135284 + ... + 144423.

It is an arithmetic number, because the mean of its divisors is an integer number (144119547).

Almost surely, 2^1278260990 is an apocalyptic number.

1278260990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1278260990 is a deficient number, since it is larger than the sum of its proper divisors (1027651762).

1278260990 is a wasteful number, since it uses less digits than its factorization.

1278260990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280171.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1278260990 is about 35752.7759761393. The cubic root of 1278260990 is about 1085.2751155225.

The spelling of 1278260990 in words is "one billion, two hundred seventy-eight million, two hundred sixty thousand, nine hundred ninety".