1261830427 has 16 divisors (see below), whose sum is σ = 1484810208. Its totient is φ = 1057178880.

The previous prime is 1261830377. The next prime is 1261830467. The reversal of 1261830427 is 7240381621.

It is a cyclic number.

It is not a de Polignac number, because 1261830427 - 2¹⁹ = 1261306139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261830392 and 1261830401.

It is not an unprimeable number, because it can be changed into a prime (1261830467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86623 + ... + 100135.

It is an arithmetic number, because the mean of its divisors is an integer number (92800638).

Almost surely, 2^1261830427 is an apocalyptic number.

1261830427 is a deficient number, since it is larger than the sum of its proper divisors (222979781).

1261830427 is a wasteful number, since it uses less digits than its factorization.

1261830427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14190.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1261830427 is about 35522.2525608948. The cubic root of 1261830427 is about 1080.6050641878.

The spelling of 1261830427 in words is "one billion, two hundred sixty-one million, eight hundred thirty thousand, four hundred twenty-seven".