1277123540 has 72 divisors (see below), whose sum is σ = 3369117696. Its totient is φ = 398059200.

The previous prime is 1277123537. The next prime is 1277123569. The reversal of 1277123540 is 453217721.

1277123540 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1277123497 and 1277123506.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 20756 + ... + 54635.

Almost surely, 2^1277123540 is an apocalyptic number.

1277123540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1277123540 is an abundant number, since it is smaller than the sum of its proper divisors (2091994156).

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

1277123540 is a wasteful number, since it uses less digits than its factorization.

1277123540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75429 (or 75416 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 1277123540 is about 35736.8652794282. The cubic root of 1277123540 is about 1084.9531122892.

The spelling of 1277123540 in words is "one billion, two hundred seventy-seven million, one hundred twenty-three thousand, five hundred forty".