1278120877 has 16 divisors (see below), whose sum is σ = 1498381632. Its totient is φ = 1077246720.

The previous prime is 1278120871. The next prime is 1278120889. The reversal of 1278120877 is 7780218721.

It is not a de Polignac number, because 1278120877 - 2³ = 1278120869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278120871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38478 + ... + 63535.

It is an arithmetic number, because the mean of its divisors is an integer number (93648852).

Almost surely, 2^1278120877 is an apocalyptic number.

1278120877 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1278120877 is a deficient number, since it is larger than the sum of its proper divisors (220260755).

1278120877 is a wasteful number, since it uses less digits than its factorization.

1278120877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102108.

The product of its (nonzero) digits is 87808, while the sum is 43.

The square root of 1278120877 is about 35750.8164522155. The cubic root of 1278120877 is about 1085.2354609424.

The spelling of 1278120877 in words is "one billion, two hundred seventy-eight million, one hundred twenty thousand, eight hundred seventy-seven".