1278555124 has 24 divisors (see below), whose sum is σ = 2789575488. Its totient is φ = 498138240.

The previous prime is 1278555121. The next prime is 1278555127. The reversal of 1278555124 is 4215558721.

It is an interprime number because it is at equal distance from previous prime (1278555121) and next prime (1278555127).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278555121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075269 + ... + 2075884.

It is an arithmetic number, because the mean of its divisors is an integer number (116232312).

Almost surely, 2^1278555124 is an apocalyptic number.

1278555124 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1278555124 is an abundant number, since it is smaller than the sum of its proper divisors (1511020364).

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

1278555124 is a wasteful number, since it uses less digits than its factorization.

1278555124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151175 (or 4151173 counting only the distinct ones).

The product of its digits is 112000, while the sum is 40.

The square root of 1278555124 is about 35756.8891823660. The cubic root of 1278555124 is about 1085.3583514793.

The spelling of 1278555124 in words is "one billion, two hundred seventy-eight million, five hundred fifty-five thousand, one hundred twenty-four".